| 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 slope ends, region made up of mountains,ridges, trenches valleys, rifts, guyots, abyssal plains,and canyons plateau |
| abysssal 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 3000ft. above sea floor |
| Mid-ocean ridge | great undersea mountain ranges characterized by frequent earthquakes and volcanoes |
| island | seamount that rises above the surface of the water |
| coverd with water | 75% of the earth's surface is covered with water |
