The blanket of sediment on the sea floor is very thin at the volcanic ridges and thickens toward the ocean margins.
Ocean margins refers to the transitional zones that lies between the oceans and continents where most of the sediments derived from the land are deposited.
The ocean margins are the region of transition from the land to the deep seafloor that is between continental and oceanic crust.
Basically, the three different features of the ocean margins are the continental rise, the continental slope, and the continental shelf.
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