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Metamorphic rocks were once igneous or sedimentary rocks, but have been changed (metamorphosed) as a result of intense heat and/or pressure within the Earth's crust. They are crystalline and often have a “squashed” (foliated or banded) texture.
marleykimmel
they were once igneous and sedimentary rocks then they metamorphosed because of intense heat and pressure within the earths crust

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