Water!
The continental shelf, continental slope, and continental rise combine to form the continental margin.
The slope is the steep incline at the edge of the continental shelf that descends into the ocean depths. The continental shelf is a gently sloping, submerged portion of a continent that extends from the shoreline to the shelf break where the slope begins.
A sharp drop-off beyond the continental shelf is called a continental slope. The continental slope marks the transition between the continental shelf and the deep ocean floor.
continental shelf
The continental shelf starts from the shore to a few miles out with less gradient of slope. The continental slope starts after shelf-break with a higher slope gradient, then follows the continental rise and abyssal-plain.
Continental shelf.
Abrasion
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contiental shelf \
A continental margin is NOT a part of a continent. It is the submerged outer edge of a continent that includes the continental shelf, continental slope, and continental rise.
It is part of a continental plate that is submerged by the ocean. At the edge of the continental shelf, the slope suddenly increases and begins to drop off, this is called the continental slope.
continental margin