Ocean trenches are the sites where old oceanic lithosphere turns down and starts descending back into the mantle.

Name: Ocean trenches are the sites where old oceanic lithosphere turns down and starts descending back into the mantle.
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Ocean trenches are formed due to the subduction of old oceanic lithosphere plates into the mantle. This process is a major driver of plate tectonics and is responsible for the formation of many geological features such as volcanoes and earthquakes.

Ocean Trenches Are the Sites Where Old Oceanic Lithosphere Turns