Discussion
Which one of the following sediment deposits cover the largest percentage of the ocean floor ?
Answer: A
Terrigenous deposits cover the largest percentage of the ocean floor, in the key. These are sediments derived from land, such as sand, silt and clay brought by rivers, winds and glaciers. They cover the continental shelves and slopes and spread far into the ocean basins. Biogenous oozes made of the remains of organisms, hydrogenous deposits formed by chemical precipitation, and cosmogenous deposits from space cover smaller areas. Option A is the keyed answer.
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