Week 4 - CheckPoint Igneous Rocks

Week 4 - CheckPoint Igneous Rocks - inside the Earth’s...

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Igneous rocks are a kind of rock that is created from the cooling of hot magma and lava. Igneous rocks start when the magma cools as well as turns into a solid. These rocks can form with crystallization or without can are created under the planet’s surface or on the planet’s surface such as volcanic rocks. When igneous rocks are formed under the surface they are formed from cooling magma that is trapped deep inside of the planet. Two classes of igneous rocks are: intrusive or plutonic, and extrusive or volcanic. Intrusive igneous rocks form through magma which cools and turns into a solid deep
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Unformatted text preview: inside the Earth’s crust. Intrusive igneous rocks are rough grained and can be viewed by the naked eye. Extrusive igneous rocks from in the Earth’s crust, in place of under similar to intrusive igneous rocks, because of the incomplete melting of rocks in the Planet’s mantle and crust. Extrusive rocks are extremely grained and you would require a microscope to observe the grains. The reason for these differences has to do with the rate of cooling and the compretion. Both of these produce different grains in the different types of igneous rocks along with other differences in appearances....
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This note was uploaded on 10/23/2011 for the course SCI 245 245 taught by Professor Hallin during the Spring '11 term at University of Phoenix.

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