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Part A How are metamorphic rocks formed? How are metamorphic rocks formed? Preexisting sediment is altered through heat and pressure. Preexisting sediment is altered through melting and pressure. Preexisting rock is altered through heat and pressure. Preexisting rock is altered through melting and pressure.

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Answer: Metamorphic rocks are formed from pre-existing rocks altered through heat and pressure.

Explanation: Metamorphic rocks are rocks produced when either igneous rocks or sedimentary rocks are been altered through the action of heat and pressure to produce a rock that have metamorphosize.

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