GEOLOGY

Detailed explanation-1: -Some ocean trenches are formed by subduction between a plate carrying continental crust and a plate carrying oceanic crust. Continental crust is always much more buoyant than oceanic crust, and oceanic crust will always subduct. Ocean trenches formed by this continental-oceanic boundary are asymmetrical.

Detailed explanation-2: -Ocean trenches are natural tectonic plate boundaries between two crustal plates. When a continental plate converges with an oceanic plate a subduction zone forms. The heavier oceanic plate subducts beneath the lighter continental plate forming a trench.

Detailed explanation-3: -Oceanic-Oceanic Convergent Boundary 4. At a convergent boundary between two plates of oceanic lithosphere, the older, denser oceanic plate will always subduct, which will cause earthquakes and form volcanic isles.

Detailed explanation-4: -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-5: -When oceanic crust collides with a continent, an oceanic-continental convergent boundary forms. The oceanic plate is denser, so it undergoes subduction. This means that the oceanic plate sinks beneath the continent, forming a deep ocean trench.