Glaciers alter the landscape through erosion and the deposition of till. Till consists of unsorted mixtures of debris that have a large range in clasts size, in which some clasts are scratched or polished by glacial drag prior to deposition. a. True
b. False

a. True

Explanation:

A glacial till is unconsolidated glacial sediment and is obtained from the erosion and transportation of material through the action of ice and the glacial is deposited at some distance. It later on forms terminal, medial and lateral moraines. As the glacier melts on land leaving pills of till in moraines and are polished before the deposition.

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.