Explain how metamorphic rocks are formed with examples.
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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 rocks are formed by the physical or chemical attraction by heat and pressure of an existing igneous or sedimentary material into a denser form. As the earth's plates move over geologic time, a plate containing igneous or sedimentary rock may become subducted under another plate.
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