| A | B |
|---|
| Continenetal Margin | region of the sea floor that contains selfs and slopes |
| 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 | beginswhhe sloop 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 udersea mountain ranges characterized by frequent earthquake and volcanoes |
| island | seamount that rises above the surface of the water |
| ___% of the earhts surface is coved with water | 75 |
