A volcanic cinder cone.
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The steep side of a dune is called the slip face. It is the side of the dune where sand grains are deposited as they slide down due to gravity.
plucking
Slip face.
A hill with a steep side is called a bluff. Bluffs can be found along coastlines or riverbanks, and they often offer scenic views due to their height and steepness.
Mesa
The steep side of the edge of a continent is called a continental slope. This feature marks the transition between the continental shelf and the deep ocean floor.
It is called the Continental Shelf
a butte
troll
plateu
A plateau is a flat highland area above sea level with steep sides.