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31 December, 16:39

Which processes form igneous rocks? A. heat and pressure B. pressure and cooling C. melting and cooling D. melting and pressure

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  1. 31 December, 16:44
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    The answer is "C", and then you have two different types of igneous rocks, one being extrusive (magma that cools faster, and cools on/near the surface, results in obsidian, basic rock, etc), and intrusive (magma that cools slowly and is inside the earth, forms diamonds and other gems of high value and appearance).
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