Lecture 1 Notes - Sediment Cement Review Rocks 3 Types...

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Cement Sediment
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Rocks – 3 Types Igneous, Sedimentary, and Metamorphic Review
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Most of the crust is made of igneous and metamorphic rocks. BUT, sedimentary rocks are the most abundant rocks on the surface Review
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End of Material for exam 1 Also, read chapters 1-4
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Igneous Rocks granite gabbro rhyolite porphyry basalt Read Chapter 5
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Igneous Rock: Rock formed by the solidification of magma or lava. If rock melts below the surface, the molten rock is called magma . Magma is buoyant (less- dense) than surrounding “country rock”, so it rises toward the surface. Magma that solidifies below the surface forms intrusive (plutonic) igneous rocks. Some magma may make it to the surface, forming lava which solidifies to become an extrusive (volcanic) igneous rock.
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Some Terminology: Molten rock is called magma if it is below the Earth’s surface Molten rock is called lava if it is on the Earth’s surface Igneous rocks that are formed beneath the surface by magma are called intrusive (also called plutonic) Igneous rocks that are formed at the surface by lava are called extrusive (also called volcanic) The rock that magma intrudes into is given the general term “country rock
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Intrusive Igneous Rock
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