Respuesta :
200oC is the approximate maximum temperature range for the formation of metamorphic rocks.
How are metamorphic rocks formed ?
Rocks that undergo metamorphosis are created when heat and pressure transform the original or parent rock into a whole new rock. Sedimentary, igneous, or even another metamorphic rock can serve as the parent rock. The Greek root of the term "metamorphic" means "To Change Form."
At subduction zones, the descending rock strata have two effects that lead to metamorphism: first, the shearing of the plates as they pass one another changes the rocks that come into touch with the descending rocks. Because of this friction, some of the rock will melt as it descends. Rock that melts is classified as igneous rather than metamorphic, however rock close to the melting rock may undergo metamorphism due to heat.
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