GEOLOGY

Detailed explanation-1: -Subduction is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.

Detailed explanation-2: -deep-sea trench, also called oceanic trench, any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7, 300 to more than 11, 000 metres (24, 000 to 36, 000 feet). They typically form in locations where one tectonic plate subducts under another.

Detailed explanation-3: -Crest. It is a deep trench on the ocean floor. Trough. It is a narrow basin on the ocean floor which is less steep than the trench. Continental Shelf.

Detailed explanation-4: -Trenches are found on the floor of the sea; however, their common name is deep ocean trenches because they are more often found in the deepest areas of the ocean. Trenches are formed in subduction zones where tectonic plates collide. There are many known trenches that scientists continue to study.

Detailed explanation-5: -The Mariana Trench was formed through a process called subduction. Earth’s crust is made up of comparably thin plates that “float” on the molten rock of the planet’s mantle. While floating on the mantle, the edges of these plates slowly bump into each other and sometimes even collide head-on.