Geologic Time. Early Earth History
|
|
- Jonas Norris
- 6 years ago
- Views:
Transcription
1 chapter 10 3 Geologic Time section 2 Early Earth History Before You Read Think of a picture of a volcano you have seen. Describe what Earth would be like if the land were almost completely covered with volcanoes. What You ll Learn what Earth was like during its early history how species adapted to changes on Earth Read to Learn Precambrian Time It may seem strange, but during the first billion years of Earth s history, the land was covered with volcanoes. Over the next 3 billion years, simple life-forms began to live in the oceans. Precambrian (pree KAM bree un) time is the longest part of Earth s history. Precambrian time lasted from about 4.5 billion years ago to about 544 million years ago. What is known about early life forms? Little is known about the organisms that lived during Precambrian time. Most Precambrian rocks are buried deep within Earth where they have been changed by heat and pressure. Few fossils can survive these conditions. Most Precambrian organisms had soft bodies. These organisms did not have hard body parts that leave fossil imprints in rock. One clue to early history of life is found in ancient stromatolites (stroh MA tuh lites). Stromatolites are layered mats formed by colonies, or groups, of cyanobacteria. Cyanobacteria are blue-green algae thought to be one of the earliest life-forms on Earth. Highlight As you read, highlight the key terms and main ideas in each paragraph. B Compare and Contrast Make the following Foldable to compare the Precambrian and the Paleozoic Eras. Reading Essentials 143
2 1. Infer How might Earth be different today if cyanobacteria had not lived in ancient seas? 2. Explain why scientists have been able to learn more about life in the Paleozoic Era than about life in Precambrian time. How did early life affect the atmosphere? Cyanobacteria first appeared on Earth about 3.5 billion years ago. Cyanobacteria contained chlorophyll and used photosynthesis. This is important because during photosynthesis, they produced oxygen, which helped change Earth s atmosphere. Following the appearance of cyanobacteria, oxygen became a major gas in the atmosphere. Also of importance was that the ozone layer in the atmosphere began to develop, shielding Earth from ultraviolet rays. It is hypothesized that these changes allowed species of single-celled organisms to evolve into more complex organisms. Near the end of Precambrian time, invertebrates (ihn VUR tuh brayts) appeared. Invertebrates are animals without backbones. Early invertebrates had soft bodies, so few were preserved as fossils. Because of this, many Precambrian fossils are trace fossils. Examples of trace fossils are tracks, trails, or burrows. Trace fossils provide information about how organisms lived and behaved. What were other unusual life-forms? In the late Precambrian, a group of animals lived that were similar to some animals today. These soft-bodied animals looked like modern jellyfish and worms. The first fossils of these earliest invertebrates were found in the Ediacara Hills of Australia. This group of organisms became known as the Ediacaran (ee dee uh KAR un) animals. They have been found on every continent, except Antarctica. Ediacaran animals lived on the bottom of Precambrian seas. Some scientists think these animals may have had tough outer coverings on their bodies. Trilobites may have outcompeted the Ediacaran animals and caused their extinction. However, no one knows for sure why the Ediacaran animals disappeared. The Paleozoic Era Beginning in the Paleozoic (pay lee uh ZOH ihk) Era, animals with shells and other hard body parts began to appear. Because hard body parts are well preserved in fossils, it is easier to find traces of life in this era. The Paleozoic Era, or era of ancient life, began about 544 million years ago and ended about 248 million years ago. 144 Geologic Time
3 What organisms lived during this era? During most of the Paleozoic Era, warm, shallow seas covered much of the planet. Many life-forms lived in the oceans. Trilobites were common, especially early in the Paleozoic. Other organisms developed shells. As a result, the fossil record of this time contains many shells. However, invertebrates weren t the only animals in Paleozoic seas. Animals with backbones, called vertebrates, evolved during this time. The earliest vertebrates were fishlike creatures without jaws. During the Devonian Period, fish with strong jaws evolved. These huge fish, armed with heavy protective coverings on their bodies, could eat large sharks. By the Devonian Period, forests began to grow on land. Some vertebrates adapted to the land environment. How did early life forms move onto land? Most fish, both ancient and modern, breathe through gills. But in the Devonian Period, many fish also had lungs. Because of their lungs, they could live in water that had low levels of oxygen and swim to the surface to breathe air. One kind of ancient fish with lungs also developed fins that were like legs, as shown in the figure below. These leglike fins were used to swim and to crawl around on the ocean floor. Paleontologists hypothesize that today s amphibians might have evolved from these fish. Modern amphibians, such as frogs, live both in water and on land. All amphibians have one thing in common they all lay their eggs in water or in a moist place. 3. Describe What did the earliest vertebrates look like? Picture This 4. Circle Draw a circle around the leglike fins on the fish shown in the figure. Reading Essentials 145
4 5. Identify What was one adaptation that allowed reptiles to live out of water? 6. Identify What collided with the North American Plate and created high mountains? What adaptations allowed reptiles to remain on land? By the Pennsylvanian Period, some amphibians evolved eggs that were covered by a protective coating. The coating helped prevent the eggs from drying out. As a result, these animals, called reptiles, did not need to lay their eggs in water. Reptiles also have skin covered with hard scales. The scales prevent water loss from their bodies. These adaptations allow reptiles to live farther from water and in dry climates where many amphibians cannot live. How were mountains formed? During the Paleozoic Era, there were great changes on Earth s surface. Several mountain ranges formed during this time. One example is the Appalachian Mountains in the Eastern United States. Mountain building occurred in several stages. First, North America moved closer to Europe and Africa. This closed the ocean that had separated them. Several volcanic island chains that had been in the ocean collided with the North American Plate. The collision of the plate and the island chains created high mountains. The next mountain-building event occurred when the African Plate crashed into the North American Plate. This collision formed mountains on both North America and Africa. Rock layers were folded and faulted. Some rocks that were near the eastern coast of the North American Plate were pushed west along faults as far as 65 km. Sediments were uplifted to form an immense mountain belt. Then, about 200 million years ago, the North American and African plates began to separate. The ocean between them began to open up again. What caused the end of the Paleozoic Era? At the end of the Paleozoic Era, more than 90 percent of all ocean species and 70 percent of all land species died. Perhaps as the supercontinent Pangaea formed, changes in the ocean and land caused species to die. Another hypothesis is that erupting volcanoes changed Earth so much that organisms could not survive. Perhaps an asteroid hit the planet and destroyed its environments. 146 Geologic Time
5 After You Read Mini Glossary cyanobacteria: blue-green algae thought to be one of the earliest life-forms on Earth Paleozoic Era: era that began about 544 million years ago and ended about 248 million years ago; has abundant fossils Precambrian time: longest part of Earth s history, lasting from about 4.5 billion years ago to about 544 million years ago 1. Review the terms and their definitions in the Mini Glossary. Then write two sentences, one about each time period covered in this section. Use the three vocabulary words in your sentences. 2. Fill in the blanks in the boxes below. Blue-green algae, called arose during the Animals without backbones, called arose during the when animals with backbones, called, evolved, also evolved. 3. Did highlighting help you understand the information in this section? Visit blue.msscience.com to access your textbook, interactive games, and projects to help you learn more about the early history of Earth. End of Section Reading Essentials 147
Geologic time. 8 th Grade
+ Geologic time 8 th Grade + Trilobites n Trilobites are small, hard-shelled animals that lived in ancient seas. Trilobites are considered to be index fossils. n Index fossils lived over vast regions of
More informationFossils. Name Date Class. A Trip Through Geologic Time Section Summary
Name Date Class A Trip Through Geologic Time Section Summary Fossils Guide for Reading How do fossils form? What are the different kinds of fossils? What does the fossil record tell about organisms and
More informationDirected Reading. Section: Precambrian Time and the Paleozoic Era EVOLUTION. beginning of life is called. to. PRECAMBRIAN TIME.
Skills Worksheet Directed Reading Section: Precambrian Time and the Paleozoic Era 1. Where is the geologic history of Earth recorded? 2. What kind of information can scientists get from the types of rock
More informationLecture Outlines PowerPoint. Chapter 12 Earth Science 11e Tarbuck/Lutgens
Lecture Outlines PowerPoint Chapter 12 Earth Science 11e Tarbuck/Lutgens 2006 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors
More informationEras of Earth's History Lesson 6
Eras of Earth's History Lesson 6 May 24 8:42 PM What happened in the Paleozoic Era? What happened in the Mesozoic Era? What happened in the Cenozoic Era? May 24 8:55 PM 1 I. What happened in the Paleozoic
More information2 Eras of the Geologic Time Scale
CHAPTER 8 2 Eras of the Geologic Time Scale SECTION The History of Life on Earth BEFORE YOU READ After you read this section, you should be able to answer these questions: What kinds of organisms evolved
More informationChapter: Geologic Time
Table of Contents Chapter: Geologic Time Section 1: Life and Geologic Time Section 2: Early Earth History Section 3: Middle and Recent Earth History 1 Geologic Time Trilobites are small, hardshelled organisms
More informationThe History of Life. Before You Read. Read to Learn
14 The History of Life section 1 Fossil Evidence of Change Before You Read Throughout Earth s history, many species have become extinct. On the lines below, name some organisms that have become extinct.
More informationThe History of Life on Earth
8 The History of Life on Earth lesson 1 Geologic Time and Mass Extinctions Grade Seven Science Content Standard. 4.b. Students know the history of life on Earth has been disrupted by major catastrophic
More informationSpring th Grade
Spring 2015 8 th Grade The geologic time scale is a record of the major events and diversity of life forms present in Earth s history. The geologic time scale began when Earth was formed and goes on until
More informationEarth s history can be broken up into 4 time periods: Precambrian Paleozoic Era Mesozoic Era Cenozoic Era
Earth s History Video Clip Earth s History Earth s history can be broken up into 4 time periods: Precambrian Paleozoic Era Mesozoic Era Cenozoic Era Scientists have put together a timeline of Earth s history
More information5 Time Marches On. TAKE A LOOK 1. Identify What kinds of organisms formed the fossils in the picture?
CHAPTER 6 5 Time Marches On SECTION The Rock and Fossil Record BEFORE YOU READ After you read this section, you should be able to answer these questions: How do geologists measure time? How has life changed
More informationA Trip Through Geologic Time
Date Class _ A Trip Through Geologic Time Chapter Test A Multiple Choice Write the letter of the correct answer on the line at the left. 1. Late in the Paleozoic Era, the supercontinent Pangaea formed.
More informationHow do we learn about ancient life? Fossil- a trace or imprint of a living thing that is preserved by geological processes.
Unit 1B Lesson 4 History of Life on Earth How do we learn about ancient life? Paleontologists scientists that studies fossils Fossil- a trace or imprint of a living thing that is preserved by geological
More informationUse Target Reading Skills
The Geologic Time Scale (pp. 286 297) This section tells why the geologic time scale is used to show Earth s history, and what the organisms were like and the major events that happened in the different
More information4) Outline the major developments that allowed life to exist on Earth.
Objectives 4) Outline the major developments that allowed life to exist on Earth. 5) Describe the types of organisms that arose during the four major divisions of the geologic time scale. Each layer of
More informationChapter Study Guide Section 17-1 The Fossil Record (pages )
Name Class Date Chapter Study Guide Section 17-1 The Fossil Record (pages 417-422) Key Concepts What is the fossil record? What information do relative dating and radioactive dating provide about fossils?
More informationTopic 7: Historical Geology
Topic 7: Historical Geology (ES. 8 b, 9 a-e, 10 a-d, 12 a, b, e) ES.8 The student will investigate and understand geologic processes including plate tectonics. Key concepts include: b) processes (faulting,
More informationFOSSILS Uncovering Clues to the Earth s Past
FOSSILS Uncovering Clues to the Earth s Past Fossils form when water replaces the cells of dead animals or plants with minerals. These minerals then petrify into rock to form the fossils we see in museums.
More informationThe Continental Drift Hypothesis
Lesson 1 The Continental Drift Hypothesis Scan Lesson 1. Then write three questions that you have about continental drift in your Science Journal. Try to answer your questions as you read. Pangaea Define
More informationSummary The Fossil Record Earth s Early History. Name Class Date
Name Class Date Chapter 17 Summary The History of Life 17 1 The Fossil Record Fossils are preserved traces and remains of ancient life. Scientists who study fossils are called paleontologists. They use
More informationEarth s History. The principle of states that geologic processes that happened in the past can be explained by current geologic processes.
Earth s History Date: Been There, Done That What is the principle of uniformitarianism? The principle of states that geologic processes that happened in the past can be explained by current geologic processes.
More informationEarth Science Ch. 14 Geologic Time. What is geologic time?
Earth Science Ch. 14 Geologic Time What is geologic time? The division of Earth s history into time units back to 4.6 b.y.a. Usually based on the life-forms that lived during certain periods May be based
More informationName Class Date. Crossword Puzzle Use the clues below to complete the puzzle.
Chapter 17 The History of Life Chapter Vocabulary Review Crossword Puzzle Use the clues below to complete the puzzle. 1 2 3 4 5 6 7 8 9 10 11 Across 2. time span shorter than an era, such as Quaternary
More informationDrifting Continents. Key Concepts
Plate Tectonics Section Summary Key Concepts What was Alfred Wegener s hypothesis about the continents? What evidence supported Wegener s hypothesis? Why was Alfred Wegener s theory rejected by most scientists
More informationThe Continental Drift Hypothesis
CHAPTER 7 Plate Tectonics LESSON 1 The Continental Drift Hypothesis What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column
More informationChapter 19. History of Life on Earth
Chapter 19 History of Life on Earth Adapted from Holt Biology 2008 Chapter 19 Section 3: Evolution of Life Key Vocabulary Terms Adapted from Holt Biology 2008 Cyanobacteria Photosynthetic prokaryotes Adapted
More informationWarm Up Name the 5 different types of fossils
Warm Up Name the 5 different types of fossils Timeline that organizes the events in Earths history. Earth is about 4.7 billion years old. More complex organism such as land plants and fish evolved only
More informationThe History of Life on Earth
CHAPTER 9 VOCABULARY & NOTES WORKSHEET The History of Life on Earth By studying the Vocabulary and Notes listed for each section below, you can gain a better understanding of this chapter. SECTION 1 Vocabulary
More informationThe Eras of the Earth In this lesson, we will study the changes that have taken place on the earth since it was formed 4.5 billion years ago. There have been big changes in the temperature of the land,
More informationEarth s Evolution Through Time
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Earth s Evolution Through Time Earth 9 th edition Chapter 22 Earth s evolution: summary in haiku form Super-continents have come and gone many times: giant bumper cars.
More informationChapter Introduction. Chapter Wrap-Up. Explosion
Chapter Introduction Lesson 1 Lesson 2 Lesson 3 Chapter Wrap-Up Geologic Time Ancient Earth The Cambrian Explosion How have natural events changed Earth over time? What do you think? Before you begin,
More informationGeologic Time. What have scientists learned about Earth s past by studying rocks and fossils?
Name Geologic Time What have scientists learned about Earth s past by studying rocks and fossils? Before You Read Before you read the chapter, think about what you know about geologic time Record your
More informationName Class Date. 2. What first appeared on Earth during Precambrian time? a. dinosaurs b. mammals c. life d. humans
Skills Worksheet Directed Reading B Section: Eras of the Geologic Time Scale 1. What are the four biggest eras in geologic history? a. Precambrian, Paleozoic, Mesozoic, and Cenozoic b. Precambrian, Prehistoric,
More informationName Test Date Hour. forms that lived only during certain periods. abundant and widespread geographically. changes to the surface of Earth.
Name Test Date Hour Earth Processes#3 - Notebook Earth s History LEARNING TARGETS I can explain the lack of evidence about the Precambrian Time. I can describe possible causes for the mass extinction in
More informationThe History of Life. Fossils and Ancient Life (page 417) How Fossils Form (page 418) Interpreting Fossil Evidence (pages ) Chapter 17
Chapter 17 The History of Life Section 17 1 The Fossil Record (pages 417 422) This section explains how fossils form and how they can be interpreted. It also describes the geologic time scale that is used
More informationIn the space provided, write the letter of the definition that best matches the term or phrase.
Skills Worksheet Directed Reading Section: The Changing Continents 1. What is the result of slow movements of tectonic plates? RESHAPING EARTH S CRUST In the space provided, write the letter of the definition
More informationEarth s Formation: 4.6 Billion Years ago
Earth s Formation: 4.6 Billion Years ago Formed from interstellar gas & dust into molten planet Earth s early atmosphere was hostile, made of carbon monoxide, methane, ammonia, nitrogen, nitrogen, sulfur,
More informationSection 17 1 The Fossil Record (pages )
Name Class Date Chapter 17 The History of Life Section 17 1 The Fossil Record (pages 417 422) This section explains how fossils form and how they can be interpreted. It also describes the geologic time
More informationModule 9: Earth's History Topic 3 Content: A Tour of Geologic Time Notes
The geologic time scale holds secrets to the life that has existed on Earth since the beginning of time. It is time for you to take a journey through the history of Earth. 1 Click on each of the segments
More informationEarth s Changing Continents
2 What You Will Learn Earth s continents have moved around Earth s surface throughout Earth s history and have only recently arrived at their current locations. Rocks and fossils provide evidence of continental
More informationSection 17 1 The Fossil Record (pages )
Chapter 17 The History of Life Section 17 1 The Fossil Record (pages 417 422) Key Concepts What is the fossil record? What information do relative dating and radioactive dating provide about fossils? What
More informationSlow and Steady By ReadWorks
By ReadWorks How did all the amazing things on our planet form? How did magnificent mountain ranges rise up in one place and beautiful beaches form elsewhere? Why do some places experience earthquakes
More informationNOTES 1. Fossils. The BIG Idea Rocks, fossils, and other types of natural evidence tell Earth s story.
Name Period Date UNIT 6 NOTES 1 Fossils Objectives Identify and describe the types of fossils. Define fossils Explain fossil formation Explain how different kinds of fossils show traces of life from Earth
More information.Biology Chapter 14 Test: The History of Life
Class: Date:.Biology Chapter 14 Test: The History of Life True/False Indicate whether the statement is true or false. 1. On the geologic time scale, an eon is longer than an era. 2. The oblong shape of
More informationThe Environment and Change Over Time
The Environment and Change Over Time Fossil Evidence of Evolution What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column if
More informationNotes on Life & Geologic Time Name:
Notes on Life & Geologic Time Name: S.W.B.A.T Explain how time can be divided into units Relate changes of Earth s to divisions on the geologic time scale Describe how plate tectonics affects Geologic
More informationWhat is the Earth s time scale?
Earth History What is the Earth s time scale? The Geological time scale is a record of the life forms and geological events in Earth s history. Scientists developed the time scale by fossils world wide.
More informationDo Now: Vocabulary: Objectives. Vocabulary: 1/5/2016. Wegener? (Can they move?) the idea that continents have moved over time?
Do Now: 1. Who was Alfred Wegener? 2. What was Pangaea? 3. Are continents fixed? (Can they move?) 4. What evidence supports the idea that continents have moved over time? Objectives What evidence suggests
More informationGeologic Time on a Strip of Paper
Geologic Time on a Strip of Paper Introduction The Earth is 4,600,000,000 years old. That s 4.6 billion years! But what does this mean? This activity is designed to help you get a feel for the age of the
More informationMajor geological events fit into a timeline, beginning with the formation of the Earth
Chapter 4 Major geological events fit into a timeline, beginning with the formation of the Earth 4.1 The origin and development of life William Smith was a canal engineer who supervised the excavation
More informationPage 143: Geologic Time
Page 143: Geologic Time Divide pages 144-147 in 6 One for each box: Hadeon Eon Archeon Eon Cambrian Period Ordovician Period Silurian Period Devonian Period Carboniferous Period Mississipian Period Pennsylvanian
More informationTales of the Past. Source: Sci-ber Text with the Utah State Office of Education
Tales of the Past Source: Sci-ber Text with the Utah State Office of Education http://www.uen.org/core/science/sciber/trb4/downloads/literacy4.pdf Do you like mystery and intrigue? Do you like to do detective
More informationGeologic Time. The Cenozoic Era. 7. Mammals evolved after dinosaurs became extinct.
Geologic Time The Cenozoic Era Key Concepts What major geologic events occurred during the Cenozoic era? What does fossil evidence reveal about the Cenozoic era? What do you think? Read the two statements
More informationGeologic Time. Geologic History and the Evolution of Life
Geologic Time Geologic History and the Evolution of Life What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column if you agree
More informationEarth s Changing Surface Chapter 4
Name Hour Due Date Earth s Changing Surface Chapter (You do not need your book) Page 1 Fossils Summary Page 2 Traces of Tracks Page 3 Finding the Relative Age of Rocks Summary. Page - Finding the Relative
More informationQuestion #1: What are some ways that you think the climate may have changed in the area where you live over the past million years?
Reading 5.2 Environmental Change Think about the area where you live. You may see changes in the landscape in that area over a year. Some of those changes are weather related. Others are due to how the
More informationUnit 10 Lesson 2 What Was Ancient Earth Like? Copyright Houghton Mifflin Harcourt Publishing Company
How Rocks and Fossils Tell a Story Sedimentary rock forms in layers. Many sedimentary rocks contain fossils. The oldest rock layers are at the bottom, and the youngest rock layers are at the top. The relative
More informationClues to the Past. Grades 6-8 Educational Program Guide
Clues to the Past Grades 6-8 Educational Program Guide OAS Science Practices: 1, 2, 3, 4, 6, 7, 8 Program Overview The Clues to the Past program will introduce students to several 300 million years old
More informationPLATE TECTONICS. SECTION 17.1 Drifting Continents
Date Period Name PLATE TECTONICS SECTION.1 Drifting Continents In your textbook, read about continental drift. Circle the letter of the choice that best completes each statement. 1. Early mapmakers thought
More information3. The diagram below shows how scientists think some of Earth's continents were joined together in the geologic past.
1. The map below shows the present-day locations of South America and Africa. Remains of Mesosaurus, an extinct freshwater reptile, have been found in similarly aged bedrock formed from lake sediments
More informationScience in the News - Plate Tectonics 1. Story
Science in the News - Plate Tectonics 1. Story Scientists who study the Earth tell us the continents and ocean floors are always moving. This movement sometimes can be violent, causing death and destruction.
More informationName Class Date. In the space provided, write the letter of the definition that best matches the term or phrase.
Skills Worksheet Directed Reading Section: The Changing Continents 1. What is the result of slow movements of tectonic plates? RESHAPING EARTH S CRUST In the space provided, write the letter of the definition
More informationChapter 7- Changes Over Time. Section 2 Evidence of Evolution
Chapter 7- Changes Over Time Section 2 Evidence of Evolution Pg 31 Topic: Evidence of Evolution (7.2) EQ: How do varying pieces of evidence support the theory of evolution and changes in Earth s history?
More informationUNIT 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 Nineteen: Changing Earth 19.1 Inside Earth 19.2 Plate Tectonics
More informationFossils & The Geologic Time Scale
Fossils & The Geologic Time Scale Fossils Preserved remains or traces of an organism that lived in the past. Fossils are formed when organisms die and are buried in sediment. Eventually the sediment builds
More informationChapter: Clues to Earth s Past
Table of Contents Chapter: Clues to Earth s Past Section : Section 2: Relative Ages of Rocks Section 3: Absolute Ages of Rocks Traces of the Distant Past Paleontologists, scientists who study fossils,
More informationDirected Reading. Section: Continental Drift. years ago? WEGENER S HYPOTHESIS
Skills Worksheet Directed Reading Section: Continental Drift 1. Who obtained new information about the continents and their coastlines 400 years ago? 2. What did people notice when they studied new world
More informationGeological Time Scale UG Hons.1 st Year) DR. CHANDAN SURABHI DAS ASST. PROF. IN GEOGRAPHY BARASAT GOVT. COLLEGE
Geological Time Scale UG Hons.1 st Year) 1 DR. CHANDAN SURABHI DAS ASST. PROF. IN GEOGRAPHY BARASAT GOVT. COLLEGE 2 Imagine putting everything that has happened on Earth into a one hour time frame! 3 12:00am
More informationVisualizing Earth Science. Chapter Overview. The Ever-Changing Earth. Early Life. Evolution and the Fossil Record. Life in the Phanerozoic Eon
Visualizing Earth Science By Z. Merali and B. F. Skinner Chapter 11 A Brief History of Life on Earth Chapter Overview The Ever-Changing Earth Early Life Evolution and the Fossil Record Life in the Phanerozoic
More informationPlate Tectonics CHAPTER 17
Plate Tectonics CHAPTER 17 Layers of the Earth A. Crust- solid, 5-70 km thick Moho Two Types of Crust: Oceanic- ocean floor, more dense then because of more iron Continental-dry land (mostly silicates
More informationName Date Class. How have geologists learned about Earth s inner structure? What are the characteristics of Earth s crust, mantle, and core?
Chapter 4 Plate Tectonics Section 1 Summary Earth s Interior How have geologists learned about Earth s inner structure? What are the characteristics of Earth s crust, mantle, and core? Earth s surface
More informationGeologic Time. What is Age? Absolute Age The number of years since the rock formed. (150 million years old, 10 thousand years old.
Geologic Time There are 2 kinds: What is Age? Absolute Age The number of years since the rock formed. (150 million years old, 10 thousand years old.) Relative Age The age compared to the ages of other
More information4 Changes in Climate. TAKE A LOOK 2. Explain Why is more land exposed during glacial periods than at other times?
Name Class CHAPTER 3 Date Climate 4 Changes in Climate SECTION National Science Education Standards BEFORE YOU READ After you read this section, you should be able to answer these questions: ES 1k, 2a
More informationEarth s Interior. Use Target Reading Skills. Exploring Inside Earth
Plate Tectonics Name Date Class Earth s Interior This section explains how scientists learn about Earth s interior. The section also describes the layers that make up Earth and explains why Earth acts
More informationUnit 6: Interpreting Earth s History
Unit 6: Interpreting Earth s History How do we know that the Earth has changed over time? Regent s Earth Science Name: Topics Relative Dating Uniformitarianism Superposition Original Horizontality Igneous
More informationFrom VOA Learning English, this is SCIENCE IN THE NEWS, in Special English. I m Kelly Jean Kelly.
From VOA Learning English, this is SCIENCE IN THE NEWS, in Special English. I m Kelly Jean Kelly. And I m Christopher Cruise. Scientists who study the Earth tell us the continents and ocean floors are
More informationHOW OLD IS THE EARTH ANYWAYS?
HOW OLD IS THE EARTH ANYWAYS? EXAMINING THE CONCEPT OF GEOLOGIC TIME Did you ever wonder about all of the things that have ever happened on Earth and how old it really is? As it turns out, Mother Earth
More informationClues to Earth s Past. Fossils and Geologic Time
Clues to Earth s Past Fossils and Geologic Time Fossils A. Paleontologists study fossils and reconstruct the appearance of animals. Fossils B. Fossils remains, imprints, or traces of prehistoric organisms
More informationHistory of Life on Earth
Lesson 4 The History of Life on Earth ESSENTIAL QUESTION How has life on Earth changed over time? By the end of this lesson, you should be able to describe the evolution of life on Earth over time, using
More informationChapter Nineteen: Changing Earth
Chapter Nineteen: Changing Earth 19.1 Inside Earth 19.2 Plate Tectonics 19.3 Plate Boundaries 19.4 Metamorphic Rocks 19.2 Learning Goals Discuss hypotheses which ultimately led to plate tectonics theory.
More informationEarth History. What is the Earth s time scale? Geological time Scale. Pre-Cambrian. FOUR Eras
The Earth is 4.6 billion years old! Earth History Mrs. Burkey ESS Cy Creek HS 17-18 If the Earth formed at midnight 6:00 am First life appears 10:00 pm First animals/plants on land 11:59 pm First humans
More informationGeologic History. Earth is very, very old
Geologic History Earth is very, very old Earth s History The history of Earth and the ages of rocks can be investigated and understood by studying rocks and fossils. Evidence of ancient, often extinct
More informationSection 1: How Did Life Begin? Chapter 19: History of Life on Earth. Section 2: The Age of Earth
Chapter 19: History of Life on Earth Section 1: How Did Life Begin? I. The Basic Chemicals of Life A. 1920s B. Earth s early oceans contained large amounts of organic molecules C. Molecules formed spontaneously
More information17-1 The Fossil Record Slide 1 of 40
1 of 40 Fossils and Ancient Life Fossils and Ancient Life Paleontologists are scientists who collect and study fossils. All information about past life is called the fossil record. The fossil record includes
More informationPlate Tectonics Practice Test
Plate Tectonics Practice Test 1. What is the main idea Alfred Wegner proposed in the Theory of Continental Drift that he published in 1915? a. The continents float on a liquid layer that allows them to
More informationUNIT 4: History Of Biological Diversity
UNIT 4: History Of Biological Diversity CHAPTER 14: The History of Life PAST NOW FUTURE? What is this? Earth s Early history Approximately 4.6 billion years ago, the Earth was formed when many pieces of
More informationEvolution Evidence of Change
6 Evolution Evidence of Change lesson 1 Fossils and Evolution Grade Seven Science Content Standard. 4.e. Students know fossils provide evidence of how life and environmental conditions have changed. Also
More information1. What is the definition of uniformitarianism? 2. What is the definition of organic? 4. What is the definition of inorganic?
Earth Science Unit 3- History of the Earth Knowledge Packet Learning Target 3B: Have you ever thought about the history of the Earth? No, well you should have because it s pretty cool. Things like mountain
More informationAfter you read this section, you should be able to answer these questions:
CHAPTER 10 1 Change Over Time SECTION The Evolution of Living Things 7.3.c, 7.3.d California Science Standards BEFORE YOU READ After you read this section, you should be able to answer these questions:
More informationHistory of Earth. Chapter 9: HISTORY OF EARTH. The Solar System. Early Earth: A Giant Impact! Early Earth. Formation of the Solar System
Chapter 9: HISTORY OF EARTH The Essential Earth, 2 nd Edition Thomas H. Jordan & John Grotzinger History of Earth Earth is 4.56 Billion Years Old Earth has experienced a rich and diverse history that we
More informationThe Moving Story of Plate Tectonics
08 January 2012 MP3 at voaspecialenglish.com The Moving Story of Plate Tectonics AP Smoke and ash from Italy's Mount Etna volcano last week FAITH LAPIDUS: This is SCIENCE IN THE NEWS in VOA Special English.
More informationCh 17 Plate Tectonics Big Idea: Most geologic activity occurs at the boundaries between plates.
Ch 17 Plate Tectonics Big Idea: Most geologic activity occurs at the boundaries between plates. 17.1 Drifting Continents 17.2 Seafloor Spreading 17.3 Plate Boundaries 17.4 Causes of Plate Motions Learning
More information2 Earth s Changing Continents
CHAPTER 9 SECTION The History of Life on Earth 2 Earth s Changing Continents California Science Standards 7.4.a, 7.4.e, 7.4.f BEFORE YOU READ After you read this section, you should be able to answer these
More information6 Evidence from the Fossil Record Th e f o s s i l r e c o r d includes all of the fossils that have existed in the
6 Evidence from the Fossil Record Th e f o s s i l r e c o r d includes all of the fossils that have existed in the 4.5 billion years of earth s history whether they have been discovered or not. Fossils
More informationDynamic Planet. Student Name. Teacher
Dynamic Planet Student Name Teacher The Dynamic Planet 1. What makes our planet dynamic? 2. Draw the Earth and its systems: 3. What makes up the four systems of our Earth? Geosphere: Hydrosphere: Atmosphere:
More informationFossils provide evidence of the change in organisms over time.
Section 1: Fossils provide evidence of the change in organisms over time. K What I Know W What I Want to Find Out L What I Learned Essential Questions What are the similarities and differences between
More informationEarth Science. Name Block. Unit 3 Review Worksheet. Circle the letter that corresponds to the correct answer
Earth Science Unit 3 Review Worksheet Name Block Circle the letter that corresponds to the correct answer 1. Which geologic principle is used when a geologist observes an outcrop or rocks and determines
More information17-1 The Fossil Record Slide 2 of 40
2 of 40 Fossils and Ancient Life What is the fossil record? 3 of 40 Fossils and Ancient Life Fossils and Ancient Life Paleontologists are scientists who collect and study fossils. All information about
More informationContinental Drift. & Plate Tectonics
Continental Drift & Plate Tectonics Alfred Wegener, a German scientist, proposed the hypothesis of CONTINENTAL DRIFT, in 1912. Hypothesis stated: All Earth s continents were once a single landmass (Pangaea)
More information