Final answer:
A bevelled cliff, a type of composite cliff, is formed through erosion by water and ice. The sharp peaks and serrated edges are the result of the processes that tear down mountains.
Step-by-step explanation:
A bevelled cliff, which is a type of composite cliff, is formed through erosion by water and ice. Once a mountain range is formed, rocks in the range are subject to erosion. The sharp peaks and serrated edges of a bevelled cliff are the result of the processes that tear down mountains. Ice is particularly effective in sculpting the rock. In a world without moving ice or running water, mountains remain smooth and dull.