What metamorphic rock? Answer: Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock is subjected to heat and pressure, causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock p.s. : A metamorphic rock is a type of rock which has been changed by extreme heat and pressure
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