What causes deep ocean trenches?

Answer 1

Subduction is a result of a collision between two tectonic plates, either oceanic to oceanic collision or oceanic to continental plate collision. The heavier, or more dense plate sinks under the more buoyant less dense plate, and is drawn down into the upper mantle.

Answer 2

Deep ocean trenches are made where one plate is submerged under another

Answer 3

Deep ocean trenches form at subduction zones where oceanic crust slides under continental crust or under another plate of oceanic crust.

Answer 4

a deep ocean trench is a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle

Answer 5

Well it is all about plate tectonics and the earth's crust moves periodically over a long time. Sometimes it moves apart and splits to create giant gaps in the earth.

Answer 6

convergent boundaries