Imagine that the magma chamber slowly cooled and hardened while the weight of the overlying rock layers stayed the same. What would most likely happen to the metamorphic conditions in the surrounding rock?

As the magma chamber cools, it supplies less heat to the surrounding rock, so the temperature decreases. The question says the overlying rock layers keep the same weight, so pressure stays about the same. With less heat, metamorphic mineral changes would generally slow or become less extensive over time; this matches choice A.

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