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How are extrusive and intrusive igneous rock formed?

April 26, 2017extrusive formed igneous intrusive rock

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How are extrusive and intrusive igneous rock formed?

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rocks are formed from magma at or above the surface of the planet, and generally display smaller mineral crystals, or no crystals at all, because of the rapid cooling environment in which they form. Chemically, an intrusive and extrusive rock could be identical, the only difference being the size of the mineral crystals they contain.