Metamorphism is the addition of heat and/or pressure to existing rocks, which causes them to change physically and/or chemically so that they become a new rock. ... All that is needed is enough heat and/or pressure to alter the existing rock's physical or chemical makeup without melting the rock entirely
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Answer:
Metamorphism is the addition of heat and/or pressure to existing rocks, which causes them to change physically and/or chemically so that they become a new rock. ... All that is needed is enough heat and/or pressure to alter the existing rock's physical or chemical makeup without melting the rock entirely