| A | B |
|---|
| Continental margin | region of the sea floor that became the shelf and slope |
| Coninental Shelf | part of the continent that is underwater |
| Continental Slope | where water deepens abruptly and the edge of the conitnental mass drops off |
| Ocean Basin floor | begins where the slope ends, region of mountains, rides, trinches, valleys, rifts, guyots,abyssal plains, and canyons platuea |
| Abyssal plain | vast smoothe areas on floor |
| Trenches | cracks on the earth's crust, deepest part 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 sea level |
| Mid-ocean ridge | great undersea mountain ranges characterized by frequent earthquake's and volcanoes |
| Island | seamount that rises above the surface of water |
| The earth's water | 75% of the earth's surface is covered in water |
