what are metamorphic rocks
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Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming. In the very hot and pressured conditions deep inside the Earth's crust, both sedimentary and igneous rocks can be changed into metamorphic rock.
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The word metamorphic is derived from 'metmorphose' which means change in form. These rocks were once igneous or sedimentary and then underwent change through physical or chemical processes. The factors that take part in changing the form of rocks are temperature and pressure, or both.
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