| 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, 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 feet above the 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 |
| Water Coverage | 75% of the earth's surface is covered in water |
