Question

multiple choice question
what are elongated, sometimes arc-shaped depressions on the seafloor several kilometers deeper than adjacent abyssal plains?
○ deep-sea trenches
○ submarine canyons
○ mid-ocean ridges
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Explanation:

Deep-sea trenches are the deep, elongated (often arc-shaped) seafloor depressions that lie several kilometers below adjacent abyssal plains. Submarine canyons are steep-sided valleys near continental shelves, while mid-ocean ridges are underwater mountain ranges, not depressions.

Answer:

deep-sea trenches