Subduction.
Ocean trenches form at areas of subduction.
The Marianas trench .
spreading
a plateau
An ocean trench does not become a volcanic island, however volcanic islands often form near ocean trenches.
The Mariana Trench is the deepest point in any ocean and is located in the Pacific Ocean.
The Marianas trench .
subduction of an oceanic plate under a continental plate.
When two of Earth's oceanic plates collide, they can form a deep valley called a trench. Trenches are often found in subduction zones where one plate is forced beneath the other, creating a deep depression in the ocean floor.
A deep ocean trench typically forms at a subduction zone, which is a convergent plate boundary where one tectonic plate is forced beneath another into the mantle. This process results in the formation of deep trenches in the ocean floor, such as the Mariana Trench in the western Pacific Ocean.
the answer i Izu the trench
well, its the ocean trench. a trench is like a giant ditch and it basically sinks in. while the ocean volcanoes converge and push up.