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