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Contents of 6.5 Why do metamorphic rocks exist at the surface?

• Mountain-building processes uplift and expose metamorphic rocks at the surface as erosion removes overlying rocks.
• Once formed, metamorphic rocks do not revert back to the original minerals at Earth's surface. There is not sufficient temperature, pressure, fluid, or time to promote the necessary reverse reactions.

6.5 Why do metamorphic rocks exist at the surface?