Glaciers cause erosion through plucking.

True. Plucking and abrasion are the two ways in which glaciers can erode the soil. Through plucking, glaciers pick up small bits and pieces of the sediment and begin to carry them to a new location. With abrasion, the glacier rubs away at the surface of the soil and pulls it apart.

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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.