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                                    What are the metamorphic rock | 
                            
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Answer»  tion:Metamorphic rocks arise from the transformation of EXISTING ROCK to new types of rock, in a PROCESS CALLED metamorphism. The original rock is subjected to temperatures greater than 150 to 200 °C and, often, elevated pressure of 100 megapascals or more, causing profound physical or chemical changes  | 
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