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Why are metamorphic rocks different from igneous and sedimentary rocks?

April 26, 2017different igneous metamorphic rocks sedimentary

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Why are metamorphic rocks different from igneous and sedimentary rocks?

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The metamorphic processes of heat and pressure can alter the parent rock (sedimentary, igneous, metamorphic) chemically or structurally into a form of rock that can only be created under certain conditions. Metamorphic rocks are not created from sedimentation and lithification or from molten material.