| Question | Answer |
| continental landmass | large land area rising above the ocean level |
| continental slope | sharp drop-off going down to the ocean bottom |
| mid-ocean ridge | huge underwater chain of mountains |
| seamount | submerged volcano rising up from the sea floor |
| island | peak of an undersea mountain which shows through the surface |
| guyot | old and worn, flat-topped seamount, always under water |
| continental shelf | gently sloping extension of he land mass, covered by a few hundred feet of ocean |
| abyssal plain | large, very flat area on the ocean floor |
| rift valley | huge crack in the middle of the undersea mountain chain |
| trench | deepest parts of the ocean, where a valley is formed by sections of the earth's crust coming together |
| ocean basin | lower parts of the earth's surface where the oceans are found |
| ocean floor | bottom of the ocean basin |
| ooze | organic sediment on the ocean floor |
| turbidity current | moving water which carries mud and sand down a slope |
| red clay | non-organic sediment on the ocean floor |
| submarine canyons | huge cut in the undersea shelf and slope, caused by moving mud and water (underwater landslide) |
| sediment | sand, gravel, clay and other materials which settle out of the ocean water and cover the ocean floor |
| plate tectonics | theory that the surface of the earth isnot one solid shell, but is made up of seven huge pieces called plates |
| oceanography | the study of the ocean |
| How much of earth is covered by oceans? | 70-75 percent |
| How deep is the ocean floor? | 9,000-11,000 feet |
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