Igneous Rocks - giving the rock a coarse texture It takes...

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Igneous Rocks Igneous rocks are solidified forms of magma on the earth’s surface. When a volcano erupts, the magma or lava is a hot thick and sometimes gooey liquid that can travel for miles and kill whatever plants animals and people in its path. When this magma cools and hardens is becomes a rock formation, also known as igneous rock. The different types of igneous rock depend on where and how the magma cools. When the magma cools and hardens beneath the surface it is considered intrusive, or plutonic igneous rock. Intrusive rock cools at a slower rate below the surface causing crystals to grow larger
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Unformatted text preview: giving the rock a coarse texture. It takes longer for this magma to cool because below the earth’s surface, the temperatures are higher and it is harder for these temperatures and gases to escape. So cooling can take a few months or even a few years. When the volcano erupts, the magma spreads over vast distances and quickly starts to cool. The magma cooled above the surface is known as extrusive or volcanic igneous rock. With the cooler temperatures above the earth’s surface, it allows the magma to cool faster, sometimes creating glass and small crystals over time....
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This note was uploaded on 06/23/2010 for the course SCI SCI/245 taught by Professor Daniellejannusch during the Spring '10 term at University of Phoenix.

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