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The continental shelf, slope, and trenches are structures on the ocean floor are equivalent to the mountains on land.
Continental shelf is the landmass underwater. It extends from a continent and results in an area of  shallow water known as a shelf sea. The shelf brake, or the slope is the point where the continental shelf ends. 
The ocean trenches topographic features on the sea floor, formed when one tectonic plate slides beneath another.

Answer;

-the continental shelf, slope, and trenches;


The continental shelf, slope, and trenches are the structures on the ocean that are equivalent to the mountains on land.


Explanation;

-Continental shelf is that shallow part of the ocean floor that begins at the shoreline and gently slopes underwater to an average depth of about 430 feet. It is normally covered with thick layers of sediment.

-Continental slope begins at the edge of the continental shelf and plunges down to depths of over two miles and are covered with thick layers of sand, mud and continental shelf.

-Ocean trenches are very deep and similar to canyons on land.

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