Continental shelf
plateu
Jagged ridges that form on mountains are called "knife-edge ridges" or simply "knife ridges." These ridges are narrow, sharp, and often dangerous to traverse due to their steep drop-offs on either side. They require expert mountaineering skills to navigate safely.
The flat land on the side of a mountain is called a plateau or a bench. It is a relatively flat area that provides a break in the steep slope of the mountain.
A Cliff.
a canyon, ravineor gorge
It is called the Continental Shelf
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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.
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.
An edge.
An edge.
The side of a sand dune facing the ocean is called leeward.
It is called a side or edge.
It is an edge.
The gunnel.
An edge.