Ocean trenches are formed by convergence at tectonic plate boundaries.
Ocean trenches are long and narrow trenches that form on the seafloor. They represent the deepest parts of the oceanic floor They may be found in all ocean basins, but the deepest ones form part of the Ring of Fire around the Pacific Ocean.
Ocean trenches are formed from the movement of tectonic plates. When two tectonic plates converge, the denser of the plates subducts under the other, creating a trench.
Alongside the trench, there is a small hill which marks the beginning point of the subducting area. Because oceanic crust is more dense than continental crust, oceanic crust always subducts when the two meet.
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