when magma cools down quickly,it becomes
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Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly forms another kind. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. Rock formed in this way is called extrusive igneous rock.
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As magma cools the elements within the magma combine and crystalize into minerals that form an igneous rock. Magma cools either below the surface or at the surface (magma that reaches the surface is called lava). As magma cools igneous rock is formed.
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