The depth of deep-ocean trenches is closely related to age: the younger the subducting plate, the deeper the trench.

Name: The depth of deep-ocean trenches is closely related to age: the younger the subducting plate, the deeper the trench.
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The depth of deep-ocean trenches is more closely related to the age of the oceanic lithosphere being subducted, with older, colder, and denser plates typically creating deeper trenches. Younger plates are less dense and do not subduct as deeply.

The Depth of Deep-Ocean Trenches Is Closely Related to Age