Ocean trenches are deep linear scars in the ocean floor caused by the divergence of plates along divergent plate boundaries.

Question

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Ocean trenches are actually formed at convergent plate boundaries, where one plate is forced under another plate in a process called subduction. As the leading edge of the subducting plate descends into the earth's mantle, it drags the overlying plate downward, creating a steep depression or trench on the seafloor.

Ocean Trenches Are Deep Linear Scars in the Ocean Floor