GEOLOGY

Detailed explanation-1: -At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench. Ocean trenches occupy the deepest layer of the ocean, the hadalpelagic zone.

Detailed explanation-2: -Deep-sea trenches generally lie seaward of and parallel to adjacent island arcs or mountain ranges of the continental margins. They are closely associated with and found in subduction zones-that is, locations where a lithospheric plate bearing oceanic crust slides down into the upper mantle under the force of gravity.

Detailed explanation-3: -Trenches are formed by subduction, a geophysical process in which two or more of Earth’s tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.

Detailed explanation-4: -Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common at subduction zones as well.