Assume geologists increased the burial rate in Region X from 1.1 mm per year to 2.0 mm per year. Which prediction best describes the effect on the time required to form metamorphic rock in Region X?

Increasing the burial rate from 1.1 mm per year to 2.0 mm per year means rocks descend faster. They therefore reach the depth and conditions needed for metamorphism sooner, reducing the time required. The best prediction is that the time would decrease, as stated in choice D.

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