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Published byIris Dean Modified over 9 years ago
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Igneous, Metamorphic, Sedimentary Rocks
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Igneous Rocks Where do Igneous rocks come from? Some of the first rocks How are they classified? – Where they are from – Texture – Mineral Composition
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Extrusive Rock Igneous rock formed by lava on the earth’s surface. (Basalt)
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Intrusive Rock Igneous rock formed when magma beneath the earth’s surface hardens. (Granite)
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Texture Extrusive=Rough or smooth Intrusive=Rough or coarse (sandpaper)
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Mineral Composition Different minerals give rock its color Feldspar (pink) Hornblende Mica (light gray) Quartz (smoky)
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Sedimentary Rocks What is sediment? How does it become rock? – Erosion-Depostition-Compaction-Cementation – THIS TAKES A LONG TIME!
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3 Main Types of Sedimentary Clastic – When pieces of rock squeeze together
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3 Main Types of Sedimentary Organic – When dead plants and animals compact together
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3 Main Types of Sedimentary Chemical – Minerals dissolve and crystalize
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Metamorphic Rocks Sedimentary or Igneous rock that changes because of heat or pressure Classifying these rocks – Foliated – Nonfoliated
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