What physical property of the underlying rock would lead to the formation of a cliff over which a waterfall may form?
A) a high resistance to erosion
B) high porosity
C) large permeability
D) very fine grain sizes

Question

Quizplus · Accepted Answer

A high resistance to erosion would prevent the rock from wearing away easily, allowing for the formation of a cliff. Additionally, this resistance to erosion would lead to differential erosion, where the rock is eroded faster in some areas than others, creating a drop-off over which a waterfall may form. High porosity, large permeability, and very fine grain sizes are unlikely to contribute to the formation of a cliff or waterfall.

What Physical Property of the Underlying Rock Would Lead to the Formation