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Convergent boundary
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==Oceanic trenches== {{See also|Oceanic trench}} Oceanic trenches are narrow topographic lows that mark convergent boundaries or subduction zones. Oceanic trenches average {{cvt|50.|to|100.|km}} wide and can be several thousand kilometers long. Oceanic trenches form as a result of bending of the subducting slab. Depth of oceanic trenches seems to be controlled by age of the oceanic lithosphere being subducted.<ref name=":0" /> Sediment fill in oceanic trenches varies and generally depends on abundance of sediment input from surrounding areas. An oceanic trench, the [[Mariana Trench]], is the deepest point of the ocean at a depth of approximately {{cvt|11,000.|m}}.{{citation needed|date=May 2023}}
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