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
The coast of Big Island of Hawaii has the steepest region of the Ocean Floor. If measured from sea bottom to mountain peak, it would be taller than Mount Everest. Rising up to Mauna Kea.
The continental shelf layer is called the shelf break. It is the steepest part of the continental shelf where the seafloor drops off sharply towards the deeper ocean floor.
Steepest is an adjective.
yes
both
The Young Ocean Floor is the part of the mantle showing between the 2 split tectonic plates.
sea floor
The terrain is the steepest when it's on the left side of the map.
Along constructive/divergent plate boundaries. This is where the new ocean floor comes from. This is the youngest part of the ocean floor that is.
The crust contains the ocean floor and also the continents on Earth.
reef
Continental Shelf.