The deep ocean trenches are the tops of the subducting plates turning downward to re-enter the asthenosphere.

Name: The deep ocean trenches are the tops of the subducting plates turning downward to re-enter the asthenosphere.
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The deep ocean trenches are the result of the subduction process, where one tectonic plate is forced downward and beneath another plate, eventually melting and being absorbed back into the mantle. The tops of the subducting plates are what create the trenches.

The Deep Ocean Trenches Are the Tops of the Subducting