21.The terms – extrusive and intrusive are used in reference to ____________ .
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The term extrusive is used for lava and term intrusive is used for magma
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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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