| A | B |
|---|
| Continental Margin | region of seafloor 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 slope 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 |
| mid-ocean ridge | great undersea mountain ranges characterized by frequent earthquakes and volcanoes |
| island | seamount that rises above the surface of the water |
| amount of water on the earth | 75% of the earth is water |
