Lecture 8 Rocks - Lecture8Rocks Chapters7,8,9,10,2,3 earthstructure BringyourID OldTestonTsquare questions Rock cycle Shows the interrelationships

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Lecture 8 Rocks
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Test Thursday September 18 Chapters 7, 8, 9, 10, 2, 3 and relevant parts of Chapter 1 on earth structure Bring your ID Old Test on T-square New Test - Will have some written questions
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Rock cycle Shows the interrelationships among the three rock types Earth as a system: the rock cycle Magma Crystallization Igneous rock Weathering, transportation, and deposition
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Rock cycle Earth as a system: the rock cycle Sediment Lithification Sedimentary rock Metamorphism Metamorphic rock Melting Magma
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Igneous rocks Form as magma cools and crystallizes Rocks formed inside Earth are called plutonic or intrusive rocks Rocks formed on the surface Formed from lava (a material similar to magma, but without gas Called volcanic or extrusive rocks
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Igneous rocks Crystallization of magma Ions are arranged into orderly patterns Crystal size is determined by the rate of cooling Slow rate forms large crystals Fast rate forms microscopic crystals Very fast rate forms glass
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Rock cycle Earth as a system: the rock cycle Full cycle does not always take place due to "shortcuts" or interruptions e.g., Sedimentary rock melts e.g., Igneous rock is metamorphosed e.g., Sedimentary rock is weathered e.g., Metamorphic rock weathers
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Igneous rocks Classification is based on the rock's texture and mineral constituents Texture Size and arrangement of crystals Types Fine-grained – fast rate of cooling Coarse-grained – slow rate of cooling Porphyritic (two crystal sizes) – two rates of cooling Glassy – very fast rate of cooling
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Fine-grained igneous texture
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Course-grained igneous texture
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Porphyritic igneous texture
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Obsidian exhibits a glassy texture
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Fine-grained igneous texture
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Classification is based on the rock's texture and mineral constituents Mineral composition
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This note was uploaded on 10/22/2008 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Institute of Technology.

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Lecture 8 Rocks - Lecture8Rocks Chapters7,8,9,10,2,3 earthstructure BringyourID OldTestonTsquare questions Rock cycle Shows the interrelationships

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