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Magma that cools and crystallizes on Earth's surface forms A. marble. B. intrusive rocks. C. extrusive rocks. D. quartz.

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Magma that cools and crystallizes on Earth's surface forms igneous rocks. Igneous rock is classified as intrusive or extrusive, intrusive igneous rock forms below the earth's surface, extrusive forms on the earth's surface so the answer to your question is Extrusive Igneous rock.
User David Heggie
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