| 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 the water deepens abruptly and the edge of the continetal land mass drops off |
| Ocean Basin Flor | begins where the slop ends,region made up of mountains, ridges, trenches, valleys, rifs, guyots, abyssal plains, and canyons plateau |
| Abyssal Plain | vast smooth areas on floor |
| Trenches | cracks on the earth's crust, deepest part of th oceans |
| guyots | flat topped volcanic mountains |
| rift | a valley that runs along the center of a ridge |
| Seamount | isolated mountain tha rises more that 3000 ft. above the sea floor |
| mid-ocean ridge | great undersea mountain ranges characterized by frequent |
| island | seamount that rises above the surface of the water |
| 75% | of the earth's surface is covered with water |
