Assume geologists increased the burial rate in Region X from 1.1mm per year to 2.0mm 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 rock is carried downward more quickly. It would reach the depth where heat and pressure can cause metamorphism sooner, so the time required would decrease. Choice A gives this prediction.

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