During the formation of metamorphic rocks, what most likely causes pressure to increase?
1.magma pockets rise
2.gravity pulls on rock
3.rock melts deep beneath the earth's surface
4. rocks beneath the earths surface are forced towards the mantle.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

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