GEOLOGY

Detailed explanation-1: -Oceanic Trenches. Oceanic trenches are formed at subduction zones. Volcanic Arcs. Volcanic arcs form parallel to subduction zones. Earthquakes. Earthquakes occur along the subduction zone. Other Subduction Features. 24-Apr-2017

Detailed explanation-2: -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-3: -A subduction zone is a region in which a portion of a tectonic plate sinks beneath another plate into the Earth’s interior. Subduction zones are defined by deep oceanic trenches, lines of volcanoes parallel to the trenches, and zones of large earthquakes that extend from the trenches landward.

Detailed explanation-4: -Subduction zones produce volcanic arcs, curving chains of steep-sided volcanoes, for example the Aleutian Islands in Alaska. Volcanoes associated with subduction zones generally have steep sides and erupt explosively.