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1 I m good. Thank you.
2
3 The Rock Cycle
4 Ag Earth Science Chapter 3.1
5 A natural occurring, inorganic crystalline material with a unique chemical composition. mineral
6 A consolidated mixture of minerals rock
7 A rock formed by the crystallization of molten magma igneous rock
8 Rock formed by from weathered products of preexisting rocks that have been transported, deposited, compacted, and cemented. sedimentary rock
9 metamorphic rock Rock formed by the alteration of preexisting rock deep within the Earth by heat, pressure, and/or chemically active fluids.
10 A model that illustrates the origin of the three basic rock types and the interrelatedness of Earth materials and processes. rock cycle
11 A body of molten rock found at depth including any dissolved gases and crystals. magma
12 Magma that reaches the Earth s surface. lava
13 The disintegration and decomposition of rock at or near the Earth s surface. weathering
14 Loose particles created by weathering and erosion of rock, by chemical precipitation from solution in water, or from the secretions of organisms and transported by water, wind, or glaciers. sediments
15 That s Random
16 A rock is any solid mass of mineral or mineral-like matter that occurs naturally as part of our planet. Rocks are classified into 3 major types Igneous Rocks Sedimentary Rocks Metamorphic Rocks Rocks
17 The Rock Cycle Interactions among the Earth s water, air, and land can cause rocks to change from one type to another The continuous processes that cause rocks to change make up the rock cycle When magma (molten material beneath the Earth s surface) cools and hardens, igneous rocks form. Magma that reaches the surface is called lava. When weathered (process by which rocks are physically and chemically broken down into small pieces called sediments) sediments are compacted and cemented together, they form sedimentary rocks. When sedimentary rocks are subjected to extreme pressure and heat, they change in metamorphic rock.
18 The Rock Cycle
19 Powers of the Earth s Rock Cycle Heat from the Earth s interior are responsible for forming both igneous and metamorphic rocks Weathering and the movement of weathered materials are generated by the sun s energy and produce sedimentary rock.
20 Another Dam Photo..
21 Ag Earth Science Chapter 3.2
22 Latin word for fire ignis
23 intrusive igneous rock Igneous rock that formed below the Earth s surface
24 extrusive igneous rock Igneous rock that has formed on the Earth s surface
25 porphyritic texture An igneous texture consisting of large crystals embedded in a matrix of much smaller crystals
26 granitic composition A compositional group of igneous rocks that indicate a rock is composed entirely of light-colored silicates, mainly quartz and feldspar
27 basaltic composition A compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calciumrich plagioclase feldspar
28 andesitic composition A composition of igneous rocks lying between felsic and mafic
29 Igneous rock composed mainly of iron and magnesium-rich minerals ultramafic
30 That s Random
31 Formation of Igneous Rocks Igneous Comes from the Latin word ignis which means fire
32 Formation of Igneous Rocks Intrusive Igneous Rocks rocks that form when magma hardens (cools) beneath the Earth s surface. Example Granite
33 Formation of Igneous Rocks Extrusive Igneous Rocks rocks that form when lava hardens (cools) above the Earth s surface. Example Rhyolite
34 Classification of Igneous Rocks Texture and composition are two characteristics used to classify igneous rocks.
35 Classification of Igneous Rocks Course Grained Texture Slow cooling = large crystals. Large crystals exhibit course-grained texture.
36 Classification of Igneous Rocks Fine Grained Texture Rapid cooling = small mineral grains. Small grains are said to have fine-grained texture.
37 Classification of Igneous Rocks Glassy Texture Lava spews on surface = may not be time for ions to arrange themselves into crystals. Random distributed ions = glassy texture.
38 Classification of Igneous Rocks Porphyritic Texture Large body of magma may take thousands of years to harden. Variety of temperature/cooling within large mass = large crystals and fine-grained minerals.
39 Classification of Igneous Rocks Granite Composition Made almost entirely of light colored silicate minerals quartz and feldspar.
40 Classification of Igneous Rocks Basaltic Composition Rocks that contain many dark silicate minerals and plagioclase.
41 Classification of Igneous Rocks Andesitic Composition In-between granite (light) and basaltic (dark) compositions.
42 Classification of Igneous Rocks Ultramafic Composed almost entirely of dark silicate minerals (peridotite).
43 Classification of Igneous Rocks
44 That s Random
45 Ag Earth Science Chapter 3.3
46 The incorporation and transportation of material by a mobile agent such as water, wind, or ice. erosion
47 The process by which an agent of erosion loses its energy and drops the sediment it is carrying. deposition
48 Process by which sediments are squeezed together by the weight of overlying materials driving out water. compaction
49 Solidification of sediments by deposition of dissolved minerals cementation
50 clastic sedimentary rock A sedimentary rock made of broken fragments of existing rock
51 chemical sedimentary rock Sedimentary rock consisting of material that was precipitated from water by either inorganic or organic means
52 That s Random
53 Formation of Sedimentary Rocks Sedimentary Comes from the Latin word sedimentum which means settling
54 Formation of Sedimentary Rocks Weathering, Erosion, and Deposition Erosion involves weathering and the removal of rock When an agent (wind, ice, water, or gravity) loses energy, it drops the sediments. Deposition the process of erosion losing energy and dropping sediment.
55 Formation of Sedimentary Rocks Compaction and Cementation Compaction process of squeezing or compacting sediments Cementation dissolved minerals are deposited in the tiny spaces among sediments.
56 Formation of Sedimentary Rocks The 5 Main Processes that Form Sedimentary Rocks weathering erosion deposition compaction cementation
57 Classification of Sedimentary Rocks Clastic Sedimentary Rocks Made up of weathered bits of rocks and minerals
58 Classification of Sedimentary Rocks Classified according to particle size Conglomerate (gravel) rounded, large gravel-size or larger pebbles cemented together Breccia (gravel) angular particles Sandstone sediments are sand-sized grains Siltstone fine-grained sediments
59 Classification of Sedimentary Rocks Chemical and Biochemical Sedimentary Rocks form when dissolved substances precipitate, or separate, from water solution. Examples limestones, rock salt, chert, flint, and rock gypsum.
60 Features of Some Sedimentary Rocks The many unique features of sedimentary rocks are clues to how, when, and where the rocks formed. Each layer is a time period Fossils are unique in sedimentary rocks
61 That s Random
62 Ag Earth Science Chapter 3.4
63 The changes in mineral composition and texture of a rock subjected to high temperatures and pressure within the Earth metamorphism
64 contact metamorphism Changes in rock caused by the heat from a nearby magma body
65 regional metamorphism Metamorphism associated with largescale mountain building
66 hydrothermal solution The hot, watery solution that escapes from the mass of magma during later stages of crystallization
67 Another Dam Photo..
68 Formation of Metamorphic Rocks Metamorphism to change form Formation of Metamorphic Rocks Most metamorphic changes occur at elevated temperatures and pressures. These conditions are found a few kilometers below the earth s surface and extend into the upper mantle
69 Formation of Metamorphic Rocks Types of Metamorphism Contact Metamorphism Hot magma moves into rock Regional Metamorphism large scale deformation and high-grade metamorphism due to extreme pressures and temperatures. (Example mountain building)
70 Agents of Metamorphism Agents of Metamorphism The agents of metamorphism are heat, pressure, and hydrothermal solutions
71 Agents of Metamorphism Heat Most important agent of metamorphism. Provides energy for chemical reactions. Heat comes from magma and change in temperature with depth.
72 Agents of Metamorphism Pressure (Stress) Increases with depth (example bottom of swimming pool). Pressure causes spaces between minerals to close = greater density.
73 Agents of Metamorphism Reactions to Solutions solutions that surround mineral grains aid in recrystallization by making it easier for ions to move. When hot, water-based solutions escape from magma, they are called hydrothermal solutions. These hot fluids promote recrystallization.
74 Classification of Metamorphic Rocks The texture of metamorphic rocks can be foliated or nonfoliated
75 Classification of Metamorphic Rocks Foliated Metamorphic Rocks a texture that gives the rock a layered appearance
76 Classification of Metamorphic Rocks Nonfoliated Metamorphic Rocks a texture that does not exhibit a banded or layered appearance.
77 THE END.. for this unit.
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