The downward plunge of cold lithosphere accounts for the existence of oceanic trenches as well as their low heat flow.

Name: The downward plunge of cold lithosphere accounts for the existence of oceanic trenches as well as their low heat flow.
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When the cold and dense lithosphere sinks into the mantle, it creates a subduction zone which leads to the formation of oceanic trenches. This process also creates a thermal boundary layer which results in lower heat flow in these areas.

The Downward Plunge of Cold Lithosphere Accounts for the Existence