Which term described as a long narrow depression in the ocean floor?

Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth.

What is a long narrow depression?

Answer: FISSION. Clue: a long narrow depression in a surface. Answer: serpens.

What do you call the depression in the ocean floor by the subduction process?

Trenches are long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.

Which term is described as a flat expanse of the ocean floor?

Which term is described as a flat expanse of ocean floor? continental shelf.