Abyssal Plain: A very wide and flat section of the deep ocean floor made of thick sediment

Continental Rise:  The area of the ocean at the bottom of the continental slope; vast underwater hill made from tons of accumulated sediment 

Continental Shelf: The underwater edge of a continent 

Continental Slope: The steep cliff-like drop from the continental edge to the ocean floor
Ocean Trench:A large indentation in the floor, similar to a canyon on land. Ocean Trench are very deep.

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