Differentiate between Extrusive rocks and Intrusive rocks.
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There are two basic types. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. ... Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.
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Extrusive igneous rocks come from lava, forming at the surface of the Earth and cooling quickly, meaning they form very small crystals. Intrusive igneous rocks come from magma, forming deep underground and taking longer to cool, meaning they form larger crystals.
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