Relier Pairs Ocean Floor FeaturesVersion en ligne oceanic landforms par Taylor Tant 1 Trench 2 Mid Ocean Ridge 3 Continental Shelf 4 Abyssal Plain 5 Rift/ Rift Zone 6 Continental Slope underwater volcanic mountains that divide the ocean floor into 2 parts The edge of the continent that is under water; shallow part of the ocean large area of flat land on the ocean floor The steep slope where the continental shelf drops to the bottom of the ocean floor the center of the highest part of the mid-ocean ridge; it is a narrow trench a steep-sided canyon with deep, narrow valleys in the bottom of the ocean.