Imagine the Bitterroot Range was uplifted and erosion removed several kilometers of rock from above the transformed zone. What would most likely happen to the metamorphic rocks now exposed near the surface over time?

Once uplift and erosion expose the metamorphic rocks near the surface, pressure and temperature are much lower than they were deep underground. The rocks would generally stay solid, but surface processes such as weathering and erosion would gradually break them down. They would not revert to their original sedimentary form, as choice A suggests.

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