Relier Pairs Oceanic reliefVersion en ligne What are these landforms? par Maru Cruz 1 Ocean trenches 2 Continental shelves 3 Abyssal plain 4 Continental slope 5 Ocean ridges Large expanse of land at the deepest part of the ocean Plains underwater near coastlines Deep depressions in the ocean floor Incline from the continental shelf down to the abyssal plain Large underwater mountain ranges