| 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 wher the slop ends, region made up of mountains, ridges, trencges, valleys, rifts, guyots, abyssalplains, and canyons plateau |
| Abyssal Plqin | vast smooth areas on floor |
| TRENCHES | cracks on the earth’s crust, deepest part of the oceans |
| GUYOTS | flat topped volcanic mountains |
| Rift | a balley 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 chacterized by frequent earthquakes and volcanoes |
| Island | seamount that rises above the surface of the water |
| 75% | of the earth's surface is covered with water |
