How do deep-ocean trenches form?
A)Magma from a partially melting tectonic plate makes its way through the crust.
B)Subducting lithosphere descends into the mantle.
C)Two tectonic plates diverge and create a rift valley.
D)Sediments from a turbidity current settle out in a deep ocean basin.

Question

Quizplus · Accepted Answer

Deep-ocean trenches are formed by the process of subduction, where one tectonic plate is forced beneath another as they converge. As the subducting plate descends into the mantle, it causes the overlying plate to bend downward, creating a trench in the ocean floor.

How Do Deep-Ocean Trenches Form