what is metamorphic rock
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Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. They are not made from molten rock – rocks that do melt form igneous rocks instead. ... They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks.
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metamorphic rocks started out as some other type of rock but have been substantially changed for thier original igneous, sedimentary or earlier metamorphic rocks
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