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Science 8—Chapter 13 After Lesson 3
Lecture Notes
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3 Types of Rocks Igneous Metamorphic Sedimentary
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Igneous Rocks— Most abundant on Earth Formed from melted rock (liquid)
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Classification—Texture
Intrusive—Formed in the earth—Slow cooling Large crystals-coarse grained Extrusive—Formed outside on the surface of the Earth—Rapid cooling Small crystals-fine grained
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Igneous Rocks— Example rocks— granite
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Igneous Rocks— Example rocks— basalt
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Igneous Rocks— Example rocks— pumice
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Igneous Rocks— Example rocks— obsidian
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Sedimentary Rocks— Most abundant on surface of Earth Formed from cementation/compaction and from deposition of minerals coming out of a liquid
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Sedimentary Rocks— Example rocks— limestone
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Sedimentary Rocks— Example rocks— shale
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Sedimentary Rocks— Example rocks— sandstone
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Metamorphic Rocks— A “Changed” Rock
Formed from parent rocks through heat, pressure, or contact of hot liquids Note!! There is NO melting involved in the formation of metamorphic rocks!
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Classification—Texture
foliated layered nonfoliated no layering
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Metamorphic Rocks— Example rocks— gneiss foliated parent rock—granite
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marble Metamorphic Rocks— Example rocks— nonfoliated
parent rock—limestone
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Metamorphic Rocks— Example rocks— slate foliated parent rock—shale
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schist Metamorphic Rocks— Example rocks— foliated
parent rock—slate, shale, gneiss
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