| A | B |
|---|
| CONTINENTAL SLOPE | Where water deepens abruptly and the edge of the continental land mass drops off |
| CONTINENTAL MARGIN | Region of the sea floor that contains the shelf and slope |
| CONTINENTAL SHELF | Part of the continent that is underwater |
| OCEAN BASIN FLOOR | begins where the slope ends, region mad 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 vally 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 |
| AMOUNT OF WATER COVERING THE EARTH | 75% of the earth’s surface is covered with water |
