| A | B |
|---|
| CONTINENTAL MARGIN | region of the sea floor that contains the shelf and slope |
| CONTINENTAL SHELF | part of the continent that is underwater |
| CONTINENTAL SLOPE | where water deepens abruptly and the edge of the continental land mass drops off |
| OCEAN BASIN FLOOR | begins where the slop ends, region made up of mountains, ridges, trenches, valleys, rifts, guyots, abyssal plains, and canyons plateau |
| ABYSSAL PLAIN | vast smooth areas on floor |
| TRENCHES | cracks on the earth’s crust, deepest part of the oceans |
| GUYOTS | flat topped volcanic mountains |
| RIFT | a valley that runs along the center of a ridge |
| SEAMOUNT | isolated mountain that rises more than 3000 ft. above the sea floor |
| MID-OCEAN RIDGE | great undersea mountain ranges characterized by frequent earthquakes and volcanoes |
| ISLAND | seamount that rises above the surface of the water |
| 75% | of the earth’s surface is covered with water |
