| A | B |
|---|
| Continental Margin | region of the sea floor that contains the shelf and slope |
| Continental Shelf | part of the continent that is under water |
| Continental Slope | where water deepens abruptly and the edge of he continental land mass drops off |
| Ocean Basin Floor | begins where the slope ends, region made up of mountains,ridges, trenches, vallys,rifts, guyots, abyssal plains, and canyons plateau |
| Abyssal Plain | vast smoothe areas on floor |
| trences | 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 be frequent earthquakes and volcanoes |
| Island | seamount that rises above the surface of the water |
| how much of earth's surface is covered with water? | 75% |
