| 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 moutains |
| 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 above the surface of the water |
| Earth's percentage of water | 75% of water |
