GENERAL KNOWLEDGE

Detailed explanation-1: -In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

Detailed explanation-2: -Oceans are formed when tectonic plates move apart at their divergent boundary, causing crustal extension. This spreading of the earth’s crust mostly takes place along the faults (breaks or fissures) on the lithospheric crust.

Detailed explanation-3: -Ocean ridges are boundaries where plates are being created, whereas trenches are boundaries where plates are being destroyed (subducted). Earthquakes occur along ALL plate boundaries, consequently they provide an ideal demarcation of individual plates.