Question

What plate boundary forms a trench

Answer 1

A trench typically forms at a convergent plate boundary, where one tectonic plate is being subducted beneath another. This process occurs when an oceanic plate collides with either another oceanic plate or a continental plate. The subduction of the denser oceanic plate leads to the creation of deep oceanic trenches, such as the Mariana Trench, which is the deepest known trench in the world.