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It is a process of the ocean floor plunging back into the interior of

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It is a process of the ocean floor plunging back into the interior of .

Older ocean floor is pushed away from the midocean ridges as new ocean floor is formed. It is believed by the scientists that the older ocean floor is then pushed down deep into the earth along the trenches. This process is Subduction.

That part of lithosphere is the older ocean floor that is pushed down along the trench: