Answer:

I THINK ITS OCEAN RIDGE OR B

Explanation:

THAT ALL

Answer:

C.Trench

Explanation:

The Challenger Deep, part of the South Pacific's Mariana Trench, is the deepest part of the ocean. Ocean trenches were not studied and explored until the 20th century. These deep-sea canyons were originally called “deeps,” such as the Challenger Deep or the Horizon Deep.

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