how are metamorphic rocks are formed
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Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

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Metamorphic rock are formed when the igneous rocks and sedimentary rocks mixed after great heat and pressure. That's how the metamorphic rock are formed.
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