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
It is called the Continental Shelf
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.
troll
a butte
plateu
A plateau is a flat highland area above sea level with steep sides.