Ocean trenches form at areas of subduction.
Trenches are most likely to occur at convergent plate boundaries, where tectonic plates collide and one is forced beneath the other in a process called subduction. This creates deep oceanic trenches, such as the Mariana Trench in the western Pacific Ocean, which is the deepest known trench on Earth.
mariana trench
convergent boundary -rift valley divergent boundary -mid-ocean ridge
in the ocean
At the bottom of the sea or ocean
You would most likely find a trench in the ocean, specifically in areas where tectonic plates meet and one plate is being forced beneath another. Trenches can also be found on land, such as man-made trenches used in warfare or for irrigation purposes.
continent-continent move together colliding making a mountain ocean-ocean or ocean-continent move together also but oceanic crust is denser so it will subduct and create a trench and one oceanic crust will be denser most likely than the other so it will also subduct and create a trench
If the two plates are continental crust then a mountain belt will form (eg the Himalayas), If one plate is continental crust and the other is oceanic crust then you will get a mountain chain on land and an oceanic trench in the adjacent ocean (eg the Andes).
Almost all the oceans have sheer drops and rather flat areas so one isn't inherently steeper then another. however the largest and steepest drop would most likely be in the Mariana trench, more specifically the challenger deep the deepest part of the trench, it is effectively a 90 degree drop nearly 7 miles deep. This trench is located in the Pacific ocean so that would have to be my answer
In late summer over tropical ocean waters
Most trenches are found in the Pacific Ocean basin. This is because the Pacific Plate is the largest tectonic plate on Earth and is actively subducting beneath other plates, leading to the formation of deep ocean trenches. The Mariana Trench, the deepest trench in the world, is located in the Pacific Ocean.
The southern part of Mississippi is most likely to be hit as it borders the Gulf of Mexico, and hurricanes form over the ocean.