Chapter 7 Lecture Outline. Volcanoes and Other Igneous Activity

Size: px
Start display at page:

Download "Chapter 7 Lecture Outline. Volcanoes and Other Igneous Activity"

Transcription

1 Chapter 7 Lecture Outline Volcanoes and Other Igneous Activity

2 Focus Question 7.1 How were the eruptions of Mount St. Helens and Hawaii s Kilauea volcano different?

3 Mount St. Helens eruption (May 18,1980) Largest historic eruption in North America Lowered peak by more than 400 m Destroyed all trees in a 400 km 2 area Mudflows 29 km down Toutle River Ejected 1 km 3 ash more than 18 km into stratosphere

4 Mount St. Helens eruption (May 18,1980)

5 Kilauea (Hawaii) Quiet eruption of fluid basaltic lava Occasional lava sprays Eruption began in 1983 and has been ongoing for more than 20 years

6 Kilauea (Hawaii)

7 Focus Question 7.2 What controls the viscosity of magma and the quiescent or explosive eruption of volcanoes?

8 The Nature of Volcanic Eruptions Magma Molten rock containing crystals and dissolved gas Source material for volcanic eruptions Lava Erupted magma

9 The Nature of Volcanic Eruptions Factors determining the violence or explosiveness of a volcanic eruption Composition of the magma Temperature of the magma Dissolved gases in the magma The above three factors control the viscosity of a given magma, which in turn controls the nature of an eruption Viscosity is a measure of a material s resistance to flow (e.g., higher viscosity materials flow with greater difficulty)

10 The Nature of Volcanic Eruption Factors affecting viscosity: Temperature hotter magmas are less viscous Composition silica (SiO 2 ) content Higher silica content = higher viscosity (e.g., felsic lava such as rhyolite) Lower silica content = lower viscosity or more fluid-like behavior (e.g., mafic lava such as basalt Dissolved gases Gas content affects magma mobility Gases expand within a magma as it nears the Earth s surface due to decreasing pressure The violence of an eruption is related to how easily gases escape from magma

11 The Nature of Volcanic Eruptions How to decrease magma viscosity Increase temperature Decrease silica content Rhyolitic magma (>70% Si) forms short, thick flows Basaltic magma (~50% Si) is fluid Add water

12 The Nature of Volcanic Eruptions

13 The Nature of Volcanic Eruptions Basaltic magma Generated by partial melting in upper mantle At oceanic crust, erupts as highly fluid lava At continental crust, collects at crust-mantle boundary Partial melting of overlying continental crust generates dense, silica-rich magma

14 The Nature of Volcanic Eruptions Quiescent eruptions Triggered by addition of magma to near-surface magma chamber Inflation and fracture of volcano summit Fluid basaltic lava Ongoing eruption of Kilauea since 1983

15 The Nature of Volcanic Eruptions

16 The Nature of Volcanic Eruptions Explosive eruptions Pressure decreases as magma rises Dissolved gas forms expanding bubbles Viscous magma expels fragmented lava and gas Buoyant plumes of material (eruption columns) Rapid ejection of magma Reduces pressure in magma chamber Causes further expansion and eruption

17 The Nature of Volcanic Eruptions

18 Focus Question 7.2 What controls the viscosity of magma and the quiescent or explosive eruption of volcanoes? Viscosity of magma is controlled by temperature, silica content, and dissolved gasses Decrease temperature = increased viscosity Increased silica = increased viscosity Decrease dissolved gas = increased viscosity

19 Focus Question 7.3 What are the three categories of materials extruded in a volcanic eruption?

20

21 Materials Extruded During an Eruption Lava flows 90% of lava is basaltic Flows in thin, broad sheets or ribbons Flow rate ~ 10 to 300 m/hr Up to 30 km/hr downhill ~ 9% is andesitic/intermediate < 1% is rhyolitic Thick flows move imperceptibly slow Don t flow beyond a few km from vents

22 Materials Extruded During an Eruption Two types of basaltic lava flows: Aa Rough, jagged blocks with sharp edges Cooler, more viscous basaltic flows Pahoehoe Smooth, ropy surfaces Hotter, less viscous basaltic flows Lava tubes Insulated pathways of a lava flow

23 Materials Extruded During an Eruption

24 Materials Extruded During an Eruption Dissolved Gases - volatiles ~ 1 6% of total magma weight ~ 70% water vapor, 15% carbon dioxide, 5% nitrogen, 5% sulfur dioxide, minor amounts of chlorine, hydrogen, and argon Contribute to atmosphere Significant quantities can alter global climate Dissolved into magma because of confining pressure

25 Materials Extruded During an Eruption Pyroclastic materials or tephra Particles erupted from a volcano Ash and dust Hot ash fuses to form welded tuff Lapilli and cinders are pea- to walnut-sized pyroclasts Blocks are larger than 64 mm Bombs are streamlined blocks ejected while still molten Scoria is vesicular ejecta Pumice is felsic equivalent

26

27

28 Focus Question 7.4 What are the basic features of a typical volcano cone?

29 Anatomy of a Volcano Volcanic landforms are the result of many generations of volcanic activity Eruptions start at a fissure Flow is localized into a circular conduit Conduit terminates at a vent Successive eruptions form a volcanic cone

30 Anatomy of a Volcano Crater Funnel-shaped depression at the summit Form by erosion during, or collapse following, eruptions Calderas are craters > 1km Flank eruptions generate parasitic cones Secondary vents that emit gas only are called fumaroles

31 Anatomy of a Volcano

32 Focus Question 7.5 What are the characteristics of shield volcanoes?

33 Shield Volcanoes Broad domed structures built by accumulation of basaltic lava Most begin as seamounts e.g., Canary Islands, Hawaiian Islands, Galapagos, Easter Island, Newberry Volcano in Oregon

34 Shield Volcanoes Mauna Loa is largest shield volcano 9 km high Low angle slopes Well-developed caldera from collapse of magma chamber following eruption

35 Shield Volcanoes Kilauea is most active and studied volcano 50 eruptions since 1823 Most recent began in 1983 Magma chamber inflates and earthquake swarms indicate an impending eruption

36 Shield Volcanoes

37 Focus Question 7.6 What are the characteristics of cinder cones?

38 Cinder Cones Cinder cones Symmetrical Steep-sided Loose accumulations of ejected scoria Commonly pea- to walnut-sized fragments Basaltic composition, reddish-brown color Some produce lava flows Craters are relatively large and deep

39 Cinder Cones Cinder cones form quickly Many in less than one month Generally in a single eruptive event Small size ( m)

40 Paricutin Observed by farmer, forming in a Mexican cornfield, 1943 Grew to 130 ft in first day, Day ft. Covered a nearby village in 1944 (aa flow) Ended in 9 years -

41 Cinder Cones

42 Focus Question 7.7 What are the characteristics of composite volcanoes?

43 Composite Volcanoes Composite cones or stratovolcanoes Located around the Ring of Fire Large, symmetrical cones Built by layers of cinder and ash alternating with lava flows Primarily silica-rich andesitic magma Associated with explosive eruptions and abundant pyroclastic material Steep summit and gradually sloping flanks

44 Mount Etna Erupts

45 Mt Vesuvius

46 79 A.D. 2m of pumice in 24hrs buried 2000, then hot gases suffocated those still alive

47 Focus Question 7.8 What are the hazards associated with volcanoes?

48 Volcanic Hazards 70 volcanic eruptions expected each year One large-volume eruption each decade 500 million people live near active volcanoes Volcanic hazards include: Pyroclastic flows Lahars Lava flows Ash and volcanic gasses

49 Volcanic Hazards Pyroclastic flow (nuee ardente) Hot volcanic gas infused in incandescent ash and lava fragments Gravity driven, can move up to 100 km/hr Low-density cloud of hot gases and fine ash on top of layer of vesicular pyroclastic material Caused by collapse of eruption columns

50 Volcanic Hazards

51 Soufriere Hills volcano A. ash cloud over Plymouth on Montserrat,, West Indies, 1996 B. by 2003 pyroclastic flows covered much of the mountain

52 Volcanic Hazards 1902 Mount Pelee, Martinique almost 28,000 casualties of Nuee Ardente

53 Volcanic Hazards Lahars Fluid mudflows Water-saturated pyroclastic materials move down steep volcanic slopes Can occur on dormant/extinct volcanoes

54 Mount Pinatubo eruption, 1991, Angeles City, Philippines

55 Volcanic Hazards Ash Can damage buildings, living things, aircraft engines Sulfur dioxide Affects air quality and creates acid rain Tsunamis Caused by collapse of volcano flanks into the ocean Atmospheric cooling Ash and aerosols reflect solar energy

56 1990 Mammoth Mountain, CA tree kill, 1990.

57 Redoubt Volcano, Alaska -December 15, KLM 747, 4 engines failed, fell ft and did restart, landing safely with 231 passengers

58

59 Secondary Effects Climate and Atmospheric Chemistry Figure 5.23 Mt Pinatubo, 12 June 1991 Mount Pinatubo The Cataclysmic 1991 Eruption of Mount Pinatubo, Philippines, Fact Sheet

60 Airborne sulfuric-acid mist formed from SO2

61 Volcanic Hazards

62 Focus Question 7.9 What are some volcanic landforms other than volcanic cones?

63 Other Volcanic Landforms Caldera Steep-sided crater less than 1 km in diameter Formed by summit collapse following draining of the magma chamber

64

65

66 Yellowstone Has Bulged as Magma Pocket Swells

67 Other Volcanic Landforms Fissure eruptions Emit basaltic lavas from fissures (fractures) Basalt plateaus Flat, broad accumulations of basalt emitted from fissures Flood basalts Molten lava having flowed long distances within a basalt plateau

68 Other Volcanic Landforms

69 Other Volcanic Landforms Volcanic necks (plugs) Eroded volcanic cones expose the solidified magma inside the conduit Pipes Volcanic necks that carried magma from depths more than 150 km below the surface

70 Other Volcanic Landforms

71 Focus Question 7.10 What are the characteristics of intrusive igneous structures?

72 Intrusive Igneous Activity Magma that crystallizes in Earth s crust displacing host or country rock forms intrusions or plutons Exposed by uplift and erosion Classified according to shape Tabular or massive May cut across existing structures Discordant Or inject parallel to features Concordant

73 Intrusive Igneous Activity

74 Intrusive Igneous Activity Tabular intrusive bodies Magma is injected into a fracture or other zone of weakness Dikes are discordant Sills are concordant

75 Intrusive Igneous Activity

76 Intrusive Igneous Activity Columnar jointing occurs as a result of shrinkage fractures that develop when igneous rocks cool

77 Intrusive Igneous Activity Large intrusive bodies include: Batholiths Linear masses of felsic rocks hundreds of km long Stocks Surface exposure < 100 km 2 Laccoliths Lift the sedimentary strata that they penetrate

78 Intrusive Igneous Activity

79 Focus Question 7.11 What are the major processes that generate magma from solid rock?

80 Partial Melting and the Origin of Magma Earth s crust and mantle are composed primarily of solid rock Rock is composed of a variety of minerals with different melting points Rocks melt over a range of temperatures Incomplete melting of rocks is partial melting

81 Partial Melting and the Origin of Magma

82 Partial Melting and the Origin of Magma Geothermal gradient averages ~25 C/km Mantle is solid under normal conditions Pressure increases melting temperature Decompression melting is triggered when confining pressure decreases Occurs at oceanic ridges

83 Partial Melting and the Origin of Magma

84 Partial Melting and the Origin of Magma Adding water lowers melting temperature Occurs at convergent boundaries

85 Partial Melting and the Origin of Magma Mantle derived magma pools beneath crustal rocks Heat from basaltic magma generates silicarich magma via melting of continental crust Also occurs during continental collisions

86 Focus Question 7.12 How does the geographic distribution of volcanoes reflect plate tectonics?

87 Plate Tectonics and Volcanic Activity Most volcanoes are found near: Ring of Fire around the Pacific Ocean Mid-ocean ridges Few are randomly distributed

88 Plate Tectonics and Volcanic Activity

89 Plate Tectonics and Volcanic Activity Intraplate volcanism A mantle plume of hot material ascends to the surface

Chapter 7 Lecture Outline. Volcanoes and Other Igneous Activity

Chapter 7 Lecture Outline. Volcanoes and Other Igneous Activity Chapter 7 Lecture Outline Volcanoes and Other Igneous Activity Mount St. Helens eruption (May 18,1980) Largest historic eruption in North America Lowered peak by more than 400 m Destroyed all trees in

More information

Prentice Hall EARTH SCIENCE

Prentice Hall EARTH SCIENCE Prentice Hall EARTH SCIENCE Tarbuck Lutgens Chapter 10 Volcanoes and Other Igneous Activity 10.1 The Nature of Volcanic Eruptions Factors Affecting Eruptions Factors that determine the violence of an eruption

More information

Foundations of Earth Science, 6e Lutgens, Tarbuck, & Tasa

Foundations of Earth Science, 6e Lutgens, Tarbuck, & Tasa Foundations of Earth Science, 6e Lutgens, Tarbuck, & Tasa Fires Within: Igneous Activity Foundations, 6e - Chapter 7 Stan Hatfield Southwestern Illinois College The nature of volcanic eruptions Characteristics

More information

Engineering Geology ECIV 2204

Engineering Geology ECIV 2204 Engineering Geology ECIV 2204 2017-2016 Chapter (4) Volcanoes Chapter 4: Volcanoes and Other Igneous Activity cataclysmic relating to or denoting a violent natural even Eventually the entire

More information

Overview of Ch. 4. I. The nature of volcanic eruptions 9/19/2011. Volcanoes and Other Igneous Activity Chapter 4 or 5

Overview of Ch. 4. I. The nature of volcanic eruptions 9/19/2011. Volcanoes and Other Igneous Activity Chapter 4 or 5 Overview of Ch. 4 Volcanoes and Other Igneous Activity Chapter 4 or 5 I. Nature of Volcanic Eruptions II. Materials Extruded from a Volcano III.Types of Volcanoes IV.Volcanic Landforms V. Plutonic (intrusive)

More information

Magma vs. Lava. Molten rock below Earth s surface is called magma. The magma that reaches the surface and erupts out of a volcano is called lava.

Magma vs. Lava. Molten rock below Earth s surface is called magma. The magma that reaches the surface and erupts out of a volcano is called lava. CH. 10.1 Be able to Explain the factors that determine the type of volcanic eruption. List the 3 types of volcanoes Describe the features of a volcano. What is a Volcano? Volcanoes are sites where molten

More information

Chapter 5 Volcanoes The Nature of Volcanic Eruptions The Nature of Volcanic Eruptions The Nature of Volcanic Eruptions

Chapter 5 Volcanoes The Nature of Volcanic Eruptions The Nature of Volcanic Eruptions The Nature of Volcanic Eruptions 1 2 3 4 5 6 7 8 9 10 11 Chapter 5 Volcanoes All eruptions involve magma Magma is molten rock that usually contains some crystals and varying amounts of dissolved gases Lava is erupted magma The behavior

More information

UGRC 144 Science and Technology in Our Lives/Geohazards

UGRC 144 Science and Technology in Our Lives/Geohazards UGRC 144 Science and Technology in Our Lives/Geohazards Session 5 Magma and Volcanism Lecturer: Dr. Patrick Asamoah Sakyi Department of Earth Science, UG Contact Information: pasakyi@ug.edu.gh College

More information

Chapter 5 Lecture. Earth: An Introduction to Physical Geology. Twelfth Edition. Volcanic Hazards. Tarbuck and Lutgens Pearson Education, Inc.

Chapter 5 Lecture. Earth: An Introduction to Physical Geology. Twelfth Edition. Volcanic Hazards. Tarbuck and Lutgens Pearson Education, Inc. Chapter 5 Lecture Earth: An Introduction to Physical Geology Twelfth Edition Volcanoes and Volcanic Hazards Tarbuck and Lutgens Chapter 5 Volcanoes The Nature of Volcanic Eruptions All eruptions involve

More information

A Volcano is An opening in Earth s crust through

A Volcano is An opening in Earth s crust through Volcanoes A Volcano is An opening in Earth s crust through which molten rock, gases, and ash erupt. Also, the landform that develops around this opening. Kinds of Eruptions Geologists classify volcanic

More information

Visualizing Earth Science. Chapter Overview. Volcanoes and Eruption Types. By Z. Merali and B. F. Skinner. Chapter 9 Volcanism and Other

Visualizing Earth Science. Chapter Overview. Volcanoes and Eruption Types. By Z. Merali and B. F. Skinner. Chapter 9 Volcanism and Other Visualizing Earth Science By Z. Merali and B. F. Skinner Chapter 9 Volcanism and Other Igneous Processes Volcanoes types and effects of eruption Chapter Overview Melting and cooling of rocks Geological

More information

Chapter 5 9/10/2011. Introduction. Volcanoes and Volcanism. Volcanism. Introduction. Introduction. Introduction

Chapter 5 9/10/2011. Introduction. Volcanoes and Volcanism. Volcanism. Introduction. Introduction. Introduction Introduction Chapter 5 Volcanism is the eruption of magma, and associated gases at the surface. Some magma erupts explosively as pyroclastic (fire-broken) rock and other erupts as lava flows. Volcanoes

More information

! Profile of Mauna Loa in Hawaii. Mauna Loa is one of five huge shield volcanoes that make up the island of Hawaii.

! Profile of Mauna Loa in Hawaii. Mauna Loa is one of five huge shield volcanoes that make up the island of Hawaii. - Shield Volcanoes - Low, rounded profiles; slope angles 2-10 ; composed of numerous flows of mafic composition and little explosive activity - Largest of all volcanoes! Shield volcanoes consist of numerous

More information

WHAT IS A MAGMA. Magma is a mixture of molten rock, volatiles and solids that is found beneath the surface of the Earth.

WHAT IS A MAGMA. Magma is a mixture of molten rock, volatiles and solids that is found beneath the surface of the Earth. UNIT - 8 VOLCANOES WHAT IS A MAGMA Magma is a mixture of molten rock, volatiles and solids that is found beneath the surface of the Earth. In some instances, it solidifies within the crust to form plutonic

More information

Part A GEOLOGY 12 CHAPTER 4 WORKSHEET VOLCANOES. Name

Part A GEOLOGY 12 CHAPTER 4 WORKSHEET VOLCANOES. Name GEOLOGY 12 CHAPTER 4 WORKSHEET VOLCANOES Name Part A 1. The rough, jumbled blocky or jagged surface of a lava flow is called a. pahoehoe b. lahar c. aa d. phreatic 2. The Cascade volcanoes like Mt. St.

More information

GEOLOGY MEDIA SUITE Chapter 12

GEOLOGY MEDIA SUITE Chapter 12 UNDERSTANDING EARTH, SIXTH EDITION GROTZINGER JORDAN GEOLOGY MEDIA SUITE Chapter 12 Volcanoes 2010 W.H. Freeman and Company Plate tectonics explains the global pattern of volcanism. Key Figure 12.20 (page

More information

Chapter 18. Volcanism

Chapter 18. Volcanism Chapter 18 Volcanism Ring of fire contains 66% of world s active volcanoes Convergent : Divergent: Icelandic Eruption Mount Etna Different Kinds of eruptions: Volcanic activity is controlled by plate tectonics,

More information

Igneous Rocks. Magma molten rock material consisting of liquid rock and crystals. A variety exists, but here are the end members:

Igneous Rocks. Magma molten rock material consisting of liquid rock and crystals. A variety exists, but here are the end members: Igneous Rocks Magma molten rock material consisting of liquid rock and crystals. A variety exists, but here are the end members: Types of Magma Basaltic, Basic or Mafic very hot (900-1200 C) very fluid

More information

A. What is a volcano?

A. What is a volcano? VOLCANISM THE ROCK CYCLE I. Introduction From: Roman god of fire, Vulcan A. What is a volcano? A conical mountain formed around a vent where lava, pyroclastic materials, and gases are erupted. I. Introduction

More information

Earth has more than 600 active volcanoes. An active volcano is one that has erupted within recorded history.

Earth has more than 600 active volcanoes. An active volcano is one that has erupted within recorded history. Volcanoes A volcano is an opening in Earth s surface that erupts gases, ash, and lava. These materials pile up in layers around the opening, forming volcanic mountains. Earth has more than 600 active volcanoes.

More information

Physical Geology, 15/e

Physical Geology, 15/e Lecture Outlines Physical Geology, 15/e Plummer, Carlson & Hammersley Copyright McGraw-Hill Education, Inc. Permission required for reproduction or display. Volcanism and Extrusive Rocks Physical Geology

More information

FOUNDATIONS OF GEOLOGY CHAPTER 2

FOUNDATIONS OF GEOLOGY CHAPTER 2 FOUNDATIONS OF GEOLOGY CHAPTER 2 2.3A- VOLCANOES Volcanoes all share common characteristics. Vent- a central channel through which gases, ash and rock are ejected. Magma- molten rock which lies several

More information

Goal 2.1 Forces in the Lithosphere. Volcanic Activity

Goal 2.1 Forces in the Lithosphere. Volcanic Activity Goal 2.1 Forces in the Lithosphere Volcanic Activity Lesson 3 Volcanoes, Part 1 Think About It What happens when you shake a can of soda and then open it? Focus Question How does the composition of magma

More information

Introduction to volcanoes. Volcano: an opening in the earth s surface through which lava, hot gases, and rock fragments erupt

Introduction to volcanoes. Volcano: an opening in the earth s surface through which lava, hot gases, and rock fragments erupt Introduction to volcanoes Volcano: an opening in the earth s surface through which lava, hot gases, and rock fragments erupt Origin of Volcanoes 1. Magma 50-100 miles below the earth s surface slowly begins

More information

Volcano Vocabulary ROCK CYCLE. Igneous REMELTED REMELTED BURIED BURIED HEAT ERODED DEPOSITED. Metamorphic Sedimentary ERODED, TRANSPORTED DEPOSITED

Volcano Vocabulary ROCK CYCLE. Igneous REMELTED REMELTED BURIED BURIED HEAT ERODED DEPOSITED. Metamorphic Sedimentary ERODED, TRANSPORTED DEPOSITED Volcano Vocabulary VOLCANISM VENT CRATER CALDERA QUIET ERUPTION EXPLOSIVE ERUPTION PYROCLASTIC DEBRIS CINDER CONE SHIELD VOLCANO COMPOSITE VOLCANO STRATO VOLCANO ACTIVE DORMANT EXTINCT INTRUSION DIKE SILL

More information

6/26/2018. Volcanoes & Volcanic Hazards Earth, Chapter 5 Chapter 5 Volcanoes

6/26/2018. Volcanoes & Volcanic Hazards Earth, Chapter 5 Chapter 5 Volcanoes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Volcanoes & Earth, Chapter 5 Chapter 5 Volcanoes From the VolcanoCam, 12 September 2007 All eruptions involve magma Magma is molten rock that usually contains some

More information

Volcanoes. Table of Contents Volcanoes and Plate Tectonics Volcanic Eruptions Volcanic Landforms

Volcanoes. Table of Contents Volcanoes and Plate Tectonics Volcanic Eruptions Volcanic Landforms Volcanoes Table of Contents Volcanoes and Plate Tectonics Volcanic Eruptions Volcanic Landforms What is a volcano? cone Conduit Or Pipe vent Side vent Central vent Crater A volcano is a vent or 'chimney'

More information

Magma. Objectives. Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary.

Magma. Objectives. Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary. Magma Objectives Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary viscosity Magma Magma The ash that spews from some volcanoes can form

More information

Volcano - A Volcano is an opening in the Earth s surface through which molten material or volcanic gases are erupted.

Volcano - A Volcano is an opening in the Earth s surface through which molten material or volcanic gases are erupted. What is a Volcano? Volcano - A Volcano is an opening in the Earth s surface through which molten material or volcanic gases are erupted. A volcano can either be a classic volcanic cone.. Mt. St. Helens,

More information

Study guide chapter 9

Study guide chapter 9 Study guide chapter 9 1. What are the three ways solid mantle material can change phase to a liquid? Associate a boundary/hot spot to each way mantle material changes phase. 1. A decrease in pressure which

More information

GEOL1 Physical Geology Laboratory Manual College of the Redwoods Lesson Five: Volcanoes Background Reading: Volcanoes Volcanic Terms: Silca:

GEOL1 Physical Geology Laboratory Manual College of the Redwoods Lesson Five: Volcanoes Background Reading: Volcanoes Volcanic Terms: Silca: Name: Date: GEOL1 Physical Geology Laboratory Manual College of the Redwoods Lesson Five: Volcanoes Background Reading: Volcanoes Volcanic Terms: Silca: SiO 2 silicon dioxide. This is quartz when it crystallizes.

More information

Chapter 7: Volcanoes 8/18/2014. Section 1 (Volcanoes and Plate Tectonics) 8 th Grade. Ring of Fire

Chapter 7: Volcanoes 8/18/2014. Section 1 (Volcanoes and Plate Tectonics) 8 th Grade. Ring of Fire Section 1 (Volcanoes and Plate Tectonics) Chapter 7: Volcanoes 8 th Grade Ring of Fire a major belt of es that rims the Pacific Ocean Volcanic belts form along the boundaries of Earth s plates as they

More information

When Mount St. Helens erupted, trapped gases caused the north side of the mountain to explode. Volcanic ash was ejected high into the atmosphere.

When Mount St. Helens erupted, trapped gases caused the north side of the mountain to explode. Volcanic ash was ejected high into the atmosphere. When Mount St. Helens erupted, trapped gases caused the north side of the mountain to explode. Volcanic ash was ejected high into the atmosphere. A volcano is a mountain that forms when magma reaches the

More information

Chapter 18 - Volcanic Activity. Aka Volcano Under the City

Chapter 18 - Volcanic Activity. Aka Volcano Under the City Chapter 18 - Volcanic Activity Aka Volcano Under the City 18.1 Magma Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Temperature and pressure increase

More information

Magma. Objectives. Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary.

Magma. Objectives. Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary. Magma Objectives Describe factors that affect the formation of magma. Compare and contrast the different types of magma. Vocabulary viscosity Magma Magma The ash that spews from some volcanoes can form

More information

A bowl shaped depression formed by the collapse of a volcano is called a. Magma that has left the vent of a volcano is known as. Lava.

A bowl shaped depression formed by the collapse of a volcano is called a. Magma that has left the vent of a volcano is known as. Lava. Magma that has left the vent of a volcano is known as Lava A bowl shaped depression formed by the collapse of a volcano is called a Caldera This can form in a caldera when magma starts to come back up

More information

Lecture 6 - Igneous Rocks and Volcanoes

Lecture 6 - Igneous Rocks and Volcanoes Lecture 6 - Igneous Rocks and Volcanoes Learning objectives Understand and be able to predict where and why magma will be forming at different tectonic settings Understand the factors controlling magma

More information

Directed Reading. Section: Volcanoes and Plate Tectonics

Directed Reading. Section: Volcanoes and Plate Tectonics Skills Worksheet Directed Reading Section: Volcanoes and Plate Tectonics 1. Some volcanic eruptions can be more powerful than a(n) a. hand grenade. b. earthquake. c. geyser. d. atomic bomb. 2. The cause

More information

1/31/2013 BASALTIC BASALTIC ANDESITIC RHYOLITIC

1/31/2013 BASALTIC BASALTIC ANDESITIC RHYOLITIC Can you predict the location of volcanoes? What is causing this eruption? What factors influence its character? A volcano is any landform from which lava, gas, or ashes, escape from underground or have

More information

The Nature of Igneous Rocks

The Nature of Igneous Rocks The Nature of Igneous Rocks Form from Magma Hot, partially molten mixture of solid liquid and gas Mineral crystals form in the magma making a crystal slush Gases - H 2 O, CO 2, etc. - are dissolved in

More information

Chapter 10: Volcanoes and Other Igneous Activity Section 1: The Nature of Volcanic Eruptions I. Factors Affecting Eruptions Group # Main Idea:

Chapter 10: Volcanoes and Other Igneous Activity Section 1: The Nature of Volcanic Eruptions I. Factors Affecting Eruptions Group # Main Idea: Chapter 10: Volcanoes and Other Igneous Activity Section 1: The Nature of Volcanic Eruptions I. Factors Affecting Eruptions Group # A. Viscosity Group # B. Dissolved Gases Group # II. Volcanic Material

More information

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. volcano sample test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Volcanic belts form along a. islands in the Pacific Ocean. b. North American

More information

Volcanology. The study of volcanoes

Volcanology. The study of volcanoes Volcanology The study of volcanoes Magma forms wherever temperature and pressure are high enough to melt rock. Some magma forms at the aesthenosphere Magma also forms at plate boundaries, where intense

More information

Effects of Eruptions. Most active in the world Kilauea, Hawaii.

Effects of Eruptions. Most active in the world Kilauea, Hawaii. Inside of Old Smokey, All covered with snow, Lurk tons of hot magma, Getting ready to blow, Objectives: From deep in the chamber, Describe how volcanoes can affect people. Up a vent to the top, Describe

More information

Objectives: Describe how volcanoes can affect people. Describe conditions that cause volcanoes. Describe the relationship between volcanoes and Earth

Objectives: Describe how volcanoes can affect people. Describe conditions that cause volcanoes. Describe the relationship between volcanoes and Earth Objectives: Describe how volcanoes can affect people. Describe conditions that cause volcanoes. Describe the relationship between volcanoes and Earth s moving plates. Inside of Old Smokey, All covered

More information

Imagine the first rock and the cycles that it has been through.

Imagine the first rock and the cycles that it has been through. A rock is a naturally formed, consolidated material usually composed of grains of one or more minerals The rock cycle shows how one type of rocky material gets transformed into another The Rock Cycle Representation

More information

Dynamic Planet PUT ALL YOUR ANSWERS ON THE ANSWER SHEET. c) low temperature d) high volatile content

Dynamic Planet PUT ALL YOUR ANSWERS ON THE ANSWER SHEET. c) low temperature d) high volatile content School Name: Team #: Students Names: Dynamic Planet 2016 Science Olympiad Invitational University of Texas at Austin PUT ALL YOUR ANSWERS ON THE ANSWER SHEET 1) Low viscosity magmas have: a) high silica

More information

Section 10.1 The Nature of Volcanic Eruptions This section discusses volcanic eruptions, types of volcanoes, and other volcanic landforms.

Section 10.1 The Nature of Volcanic Eruptions This section discusses volcanic eruptions, types of volcanoes, and other volcanic landforms. Chapter 10 Section 10.1 The Nature of Volcanic Eruptions This section discusses volcanic eruptions, types of volcanoes, and other volcanic landforms. Reading Strategy Previewing Before you read the section,

More information

Volcanoes. Volcanic eruptions can be more powerful than the explosion of an atomic bomb.

Volcanoes. Volcanic eruptions can be more powerful than the explosion of an atomic bomb. Ch. 13 Volcanoes Volcanoes Volcanic eruptions can be more powerful than the explosion of an atomic bomb. Many of these eruptions are caused by the movement of tectonic plates. Volcanism Volcanism-any activity

More information

3.2 Notes: Volcanoes Form as Molten Rock Erupts

3.2 Notes: Volcanoes Form as Molten Rock Erupts 3.2 Notes: Volcanoes Form as Molten Rock Erupts Think about What happens when a volcano erupts? Volcanoes erupt many types of material Earth s thin outer layer is, but most of Earth is extremely hot rock

More information

Directed Reading. Section: Volcanic Eruptions. light in color is called a. felsic. b. oceanic. c. mantle. d. mafic. dark in color is called

Directed Reading. Section: Volcanic Eruptions. light in color is called a. felsic. b. oceanic. c. mantle. d. mafic. dark in color is called Skills Worksheet Directed Reading Section: Volcanic Eruptions 1. Lava provides an opportunity for scientists to study a. the nature of Earth s inner core. b. the nature of Earth s tectonic plates. c. temperatures

More information

Critical Thinking 1. Contrast How could you tell the difference between a mafic rock and a felsic rock by looking at them?

Critical Thinking 1. Contrast How could you tell the difference between a mafic rock and a felsic rock by looking at them? CHAPTER 13 2 SECTION Volcanoes Volcanic Eruptions KEY IDEAS As you read this section, keep these questions in mind: How does the composition of magma affect volcanic eruptions and lava flow? What are the

More information

Volcano: a weak spot in the crust where molten material or magma comes to the surface

Volcano: a weak spot in the crust where molten material or magma comes to the surface Chapter 7 Volcano: a weak spot in the crust where molten material or magma comes to the surface Magma: a molten mixture of rock forming substances, gases and H 2 O from the mantle Volcanic Belts: Form

More information

Essentials of Geology, 11e

Essentials of Geology, 11e Essentials of Geology, 11e Igneous Rocks and Intrusive Activity Chapter 3 Instructor Jennifer Barson Spokane Falls Community College Geology 101 Stanley Hatfield Southwestern Illinois College Characteristics

More information

NC Earth Science Essential Standards

NC Earth Science Essential Standards NC Earth Science Essential Standards EEn. 2.1 Explain how processes and forces affect the Lithosphere. EEn. 2.1.1 Explain how the rock cycle, plate tectonics, volcanoes, and earthquakes impact the Lithosphere.

More information

Erupted and killed approximately 15,000 people 200 years ago

Erupted and killed approximately 15,000 people 200 years ago 1 2 3 4 5 6 7 8 Introduction to Environmental Geology, 5e Chapter 8 Volcanic Activity Volcanoes: summary in haiku form A volcano forms. Magma comes to the surface - explodes, if felsic. Case History: Mt.

More information

Unit 4 Lesson 4 Volcanoes. Copyright Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 Volcanoes. Copyright Houghton Mifflin Harcourt Publishing Company Magma Magic What is a volcano? A volcano is any place where gas, ash, or melted rock come out of the ground. Many volcanoes are dormant, meaning an eruption has not occurred in a long period of time. What

More information

Volcano. Magma. Lava. weak spot in crust where magma and gases come up. molten mixture of rockforming

Volcano. Magma. Lava. weak spot in crust where magma and gases come up. molten mixture of rockforming Volcanoes Volcano weak spot in crust where magma and gases come up Magma Lava molten mixture of rockforming substance, gases, water from the mantle Magma that flows onto earth surface forms solid rock

More information

V o l c a n o es. Part I Composition. Types of deposits. Types of volcanoes Distribution

V o l c a n o es. Part I Composition. Types of deposits. Types of volcanoes Distribution V o l c a n o es Part I Composition Types of deposits Types of volcanoes Distribution Volcano: A mound of material that is extruded to the Earth s surface from a vent that is connected to a magma chamber

More information

Geology 101. Reading Guide for Chapters 1, 4, and 5

Geology 101. Reading Guide for Chapters 1, 4, and 5 Geology 101 Name Reading Guide for Chapters 1, 4, and 5 The purpose of the Reading Guides is to help you sort out the most important ideas in the text. I recommend answering the questions as you read the

More information

GLY July Ms. Nelda Breedt. Plates move slowly and eventually.

GLY July Ms. Nelda Breedt. Plates move slowly and eventually. GLY 162 Tectonic Processes: Volcanism Ms. Nelda Breedt GLY 162 Environmental Geology Plate Tectonics Plates move slowly and eventually. 2 Spread apart (divergent plates) Dive beneath one another (converging

More information

IGNEOUS ROCKS AND IGNEOUS ACTIVITY

IGNEOUS ROCKS AND IGNEOUS ACTIVITY DATE DUE: Ms. Terry J. Boroughs Geology 305 Name: Section: IGNEOUS ROCKS AND IGNEOUS ACTIVITY Instructions: Read each question carefully before selecting the BEST answer. Use GEOLOGIC vocabulary where

More information

OIKOS > volcano > mechanism >types of volcanoes

OIKOS > volcano > mechanism >types of volcanoes Main Types of Volcanoes Volcanologists have classified volcanoes into groups based on the shape of the volcano, the materials they are built of, and the way the volcano erupts. The main one can be described

More information

IGNEOUS ROCKS AND IGNEOUS ACTIVITY

IGNEOUS ROCKS AND IGNEOUS ACTIVITY DATE DUE: Ms. Terry J. Boroughs Geology 300 Name: Section: IGNEOUS ROCKS AND IGNEOUS ACTIVITY Instructions: Read each question carefully before selecting the BEST answer. Use GEOLOGIC vocabulary where

More information

Chapter 11 Section 2 VOLCANOES TB 337

Chapter 11 Section 2 VOLCANOES TB 337 Chapter 11 Section 2 VOLCANOES TB 337 http://www.brainpop.com/science/earthsystem/volcanoes/ I. How do volcanoes form? Rising Magma leads to eruptions. Magma (solids and gases) are spewed out to form cone-shape

More information

Geology of the Hawaiian Islands

Geology of the Hawaiian Islands Geology of the Hawaiian Islands Class 4 22 January 2004 Turn in Homework #1 Any Questions? IMPORTANT Big Island Field Trip We need a $162 payment for airfare BEFORE January 29 th Description of logistics,

More information

Geology 1 st Semester Exam YSBAT

Geology 1 st Semester Exam YSBAT 1. What is the role of a geologist? Geology 1 st Semester Exam YSBAT 2016-2017 2. Earth is subdivided into three main layers based on what? 3. What features do you find at divergent boundaries? 4. Rock

More information

Get Ready for an ERUPTION!!! VOLCANOES

Get Ready for an ERUPTION!!! VOLCANOES Get Ready for an ERUPTION!!! VOLCANOES VOLCANOS Three Types of Volcanos Shield Cinder Cone Composite LAND FORMATIONS FROM LAVA & ASH Shield Volcano Created by hot spots Gently sloping Cinder Volcano Steep

More information

Get Ready for an ERUPTION!!!

Get Ready for an ERUPTION!!! Get Ready for an ERUPTION!!! Three Types of Volcanos Shield Cinder Cone Composite Shield Volcano Created by hot spots Gently sloping Cinder Volcano Steep Cone-shaped hill/ mountain Composite Volcano Tall,

More information

Constructive & Destructive Forces

Constructive & Destructive Forces Constructive & Destructive Forces Intro: Constructive Forces Processes that create landforms. Destructive Forces Processes that destroy landforms. Intro: Constructive Forces Volcanoes Deposition Landslides

More information

Directed Reading. Section: Volcanic Eruptions

Directed Reading. Section: Volcanic Eruptions Skills Worksheet Directed Reading Section: Volcanic Eruptions 1. Lava provides an opportunity for scientists to study a. the nature of Earth s inner core. b. the nature of Earth s tectonic plates. c. temperatures

More information

3/24/2016. Geology 12 Mr. M. Gauthier 24 March 2016

3/24/2016. Geology 12 Mr. M. Gauthier 24 March 2016 Geology 12 Mr. M. Gauthier 24 March 2016 Introduction: Mt. St. Helens Before 1980 Mt. St Helens, in Southern Washington State, had not erupted since 1857 On March 27,1980 minor ashand eruptions were due

More information

Types of Volcanoes KEY CONCEPT: TECTONIC PLATE MOTIONS CAN RESULT IN VOLCANIC ACTIVITY AT PLATE BOUNDARIES.

Types of Volcanoes KEY CONCEPT: TECTONIC PLATE MOTIONS CAN RESULT IN VOLCANIC ACTIVITY AT PLATE BOUNDARIES. Types of Volcanoes KEY CONCEPT: TECTONIC PLATE MOTIONS CAN RESULT IN VOLCANIC ACTIVITY AT PLATE BOUNDARIES. Volcanoes How do volcanoes work? How do volcanoes work? Magma is forced onto Earth s surface.

More information

2/25/2013. Volcanoes: summary in haiku form A volcano forms. Magma comes to the surface - explodes, if felsic.

2/25/2013. Volcanoes: summary in haiku form A volcano forms. Magma comes to the surface - explodes, if felsic. Introduction to Environmental Geology, 5e Edward A. Keller Chapter 8 Volcanic Activity Volcanoes: summary in haiku form A volcano forms. Magma comes to the surface - explodes, if felsic. Lecture Presentation

More information

Igneous and Metamorphic Rock Forming Minerals. Department of Geology Mr. Victor Tibane SGM 210_2013

Igneous and Metamorphic Rock Forming Minerals. Department of Geology Mr. Victor Tibane SGM 210_2013 Igneous and Metamorphic Rock Forming Minerals Department of Geology Mr. Victor Tibane 1 SGM 210_2013 Intrusive and Effusive Rocks Effusive rocks: rapid cooling small crystalls or glas Lava & ash Magmatic

More information

Chapter 12 Vocabulary and Study Guide Volcanoes

Chapter 12 Vocabulary and Study Guide Volcanoes Chapter 12 Vocabulary and Study Guide Volcanoes 1) acid rain Moisture with a PH below 5.6 that falls to Earth as rain or snow and can damage forests, harm organisms, and corrode structures. Sulfurous gases

More information

The mantle under the crust (about 2,890 km deep) is composed mostly of silicate rocks rich in magnesium and iron. The elements of the crust have

The mantle under the crust (about 2,890 km deep) is composed mostly of silicate rocks rich in magnesium and iron. The elements of the crust have The mantle under the crust (about 2,890 km deep) is composed mostly of silicate rocks rich in magnesium and iron. The elements of the crust have derived from the mantle by fractional melting that operates

More information

Chapter 5 The Wrath of Vulcan: Volcanic Eruptions

Chapter 5 The Wrath of Vulcan: Volcanic Eruptions Chapter 5 The Wrath of Vulcan: Volcanic Eruptions The Wrath of Vulcan: Volcanic Eruptions Updated by: Rick Oches, Professor of Geology & Environmental Sciences Bentley University Waltham, Massachusetts

More information

Volcanoes. Presented by Kesler Science

Volcanoes. Presented by Kesler Science Presented by Kesler Science Essential Questions: 1. What are the parts of a volcano? 2. What are the four types? 3. What processes form volcanoes? 4. Where are volcanoes located on earth? What is a Volcano?

More information

Introduction to Earth s s Spheres The Benchmark

Introduction to Earth s s Spheres The Benchmark Introduction to Earth s s Spheres The Benchmark Volcanism Volcanic eruptions Effusive: lavas (e.g., Kilauea) Volcanism Volcanic eruptions Explosive: pyroclastic rocks (e.g., Krakatau) Factors Governing

More information

VULCANICITY. What is vulcanicity?

VULCANICITY. What is vulcanicity? VULCANICITY What is vulcanicity? Vulcanicity is the process through which gases and molten rock are either extruded (poured) on the earth's surface or intruded (forced) into the earth's crust. Molten rock

More information

Chapter 4 Up from the Inferno: Magma and Igneous Rocks

Chapter 4 Up from the Inferno: Magma and Igneous Rocks Chapter 4 Up from the Inferno: Magma and Igneous Rocks Up from the Inferno: Magma and Igneous Rocks Updated by: Rick Oches, Professor of Geology & Environmental Sciences Bentley University Waltham, Massachusetts

More information

Igneous Rock. Magma Chamber Large pool of magma in the lithosphere

Igneous Rock. Magma Chamber Large pool of magma in the lithosphere Igneous Rock Magma Molten rock under the surface Temperature = 600 o 1400 o C Magma Chamber Large pool of magma in the lithosphere Magma chamber - most all magma consists of silicon and oxygen (silicate)

More information

EARTH SCIENCE KESSEL

EARTH SCIENCE KESSEL EARTH SCIENCE KESSEL Bell Ringer List everything you KNOW about a volcano (at least 3 things). Then list everything you WANT to know about volcanoes (at least 2 things). Bell Ringer What evidence might

More information

Earthquakes and Volcanoes

Earthquakes and Volcanoes Earthquakes and Volcanoes Volcanoes What do you think? Read the three statements below and decide whether you agree or disagree with them. Place an A in the Before column if you agree with the statement

More information

Volcanoes. Environmental Geology, Mr. Paul Lowrey Stacey Singleton, Cassandra Combs, Dwight Stephenson, Matt Smithyman

Volcanoes. Environmental Geology, Mr. Paul Lowrey Stacey Singleton, Cassandra Combs, Dwight Stephenson, Matt Smithyman Volcanoes Environmental Geology, Mr. Paul Lowrey Stacey Singleton, Cassandra Combs, Dwight Stephenson, Matt Smithyman EMPACTS Project, Spring 2017 Northwest Arkansas Community College, Bentonville, AR

More information

Volcanoes. I Types of Volcanoes II Plutonic Activity III Plate Tectonics and Igneous Activity IV Magma and Lava V Types of Lava Flows

Volcanoes. I Types of Volcanoes II Plutonic Activity III Plate Tectonics and Igneous Activity IV Magma and Lava V Types of Lava Flows Volcanoes I Types of Volcanoes II Plutonic Activity III Plate Tectonics and Igneous Activity IV Magma and Lava V Types of Lava Flows 1 Some Definitions Igneous refers to processes and rocks involving or

More information

A Rock is A group of minerals that have been put together in several different ways.

A Rock is A group of minerals that have been put together in several different ways. A Rock is A group of minerals that have been put together in several different ways. Depending on how they are put together, rocks are classified as: 1. Sedimentary 2. Igneous 3. Metamorphic Sedimentary

More information

Chapter Twelve: Earthquakes

Chapter Twelve: Earthquakes The Changing Earth Chapter Twelve: Earthquakes 12.1 Earthquakes 12.2 Volcanoes Investigation 12B Volcanoes How are volcanoes and plate boundaries related? 12.2 Looking inside a volcano A volcano is where

More information

UNIT SIX: Earth s Structure. Chapter 18 Earth s History and Rocks Chapter 19 Changing Earth Chapter 20 Earthquakes and Volcanoes

UNIT SIX: Earth s Structure. Chapter 18 Earth s History and Rocks Chapter 19 Changing Earth Chapter 20 Earthquakes and Volcanoes UNIT SIX: Earth s Structure Chapter 18 Earth s History and Rocks Chapter 19 Changing Earth Chapter 20 Earthquakes and Volcanoes Chapter Twenty: Earthquakes and Volcanoes 20.1 Earthquakes 20.2 Volcanoes

More information

Tectonics of Magma. From partial melting of mantle Occurs at oceanic ridges and mantle plumes More dense: makes oceanic crust

Tectonics of Magma. From partial melting of mantle Occurs at oceanic ridges and mantle plumes More dense: makes oceanic crust VOLCANOES Tectonics of Magma Basaltic magma From partial melting of mantle Occurs at oceanic ridges and mantle plumes More dense: makes oceanic crust Granitic magma From melting of crust, with water as

More information

What is Inside a Volcano?

What is Inside a Volcano? Volcanoes What is Inside a Volcano? A magma chamber filled with molten rock deep underground that feeds the volcano Magma is released through vents during an eruption Types of Volcanic Eruptions Non-Explosive

More information

Rocks. 1) igneous = fiery 2) sedimentary = settled 3) metamorphic = changed form

Rocks. 1) igneous = fiery 2) sedimentary = settled 3) metamorphic = changed form Rocks Identified on the basis of composition and texture (arrangement of features). Classification depends on description and interpretation of these features. Three major categories: 1) igneous = fiery

More information

Igneous Rocks. Definition of Igneous Rocks. Igneous rocks form from cooling and crystallization of molten rock- magma

Igneous Rocks. Definition of Igneous Rocks. Igneous rocks form from cooling and crystallization of molten rock- magma Igneous Rocks Definition of Igneous Rocks Igneous rocks form from cooling and crystallization of molten rock- magma Magma molten rock within the Earth Lava molten rock on the Earth s s surface Igneous

More information

When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is called igneous rock.

When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is called igneous rock. This website would like to remind you: Your browser (Apple Safari 4) is out of date. Update your browser for more security, comfort and the best experience on this site. Encyclopedic Entry magma For the

More information

Types of Volcanoes. Key Concept: Tectonic plate motions can result in volcanic activity at plate boundaries.

Types of Volcanoes. Key Concept: Tectonic plate motions can result in volcanic activity at plate boundaries. Types of Volcanoes Key Concept: Tectonic plate motions can result in volcanic activity at plate boundaries. Volcanoes How do volcanoes work? How do volcanoes work? Magma is forced onto Earth s surface.

More information

VOLCANOES. Homework due Wed./Thurs. I have a few copies left, or get by moodle or webpage

VOLCANOES. Homework due Wed./Thurs. I have a few copies left, or get by moodle or webpage VOLCANOES Homework due Wed./Thurs. I have a few copies left, or get by moodle or webpage Bowen s Reaction Series Oceanic basin tectonics http://my.execpc.com/~acmelasr/mountains/geogramsnf.html Icelandic

More information

Magma is a complex mixture of liquid, solid and gas

Magma is a complex mixture of liquid, solid and gas Magma is a complex mixture of liquid, solid and gas Liquid molten silicate Solid early-formed minerals Gas Generally 0.1% to 5% of the magma by weight, but can be as much as 15% >90% of the gas in magma

More information

Convergent Plate Boundary Geologic Features

Convergent Plate Boundary Geologic Features Convergent Plate Boundary Geologic Features Ocean Trench Mtn / Volcano New Ocean Crust Old Continenta l Crust Beadle, 2009 Convection cells provide the force to move the continents. The crust is carried

More information

Bryson Extra Credit Reading

Bryson Extra Credit Reading VOLCANOES New homework due next Tuesday, Nov 23 Extra Credit Chapter 14 The Fire Below due next Tuesday, Nov 23 Bryson Extra Credit Reading A Short History of Nearly Everything Chapter 14: The Fire Below

More information