In this diagram, subduction occurs which leads to the formation of V-shaped trench.
Trenches are formed due to subduction which is a geophysical process in which two or more of Earth's tectonic plates converge. The older and denser plate is go beneath the lighter plate and deep into the mantle due to its higher weight.
This causing the seafloor and outermost crust on which we live to bend and form a steep usually a V-shaped depressions so we can conclude that subduction process is responsible for the V-shaped trench present in the diagram.
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