| A | B |
|---|
| global ocean | the body of salt water that covers nearly 3/4ths of Earth's surface |
| sea | large, commonly saline body of water; smaller than an ocean & may be partially or completely surrounded by land |
| oceanography | scientific study of ocean; properties & movements of ocean water, characteristics of ocean floor & organisms |
| sonar | "sound navigation & ranging"-system that uses acoustic signals & returned echoes to determine the location of objects or to communicate |
| continental margin | the shallow sea floor that is located between the shoreline & the deep-ocean bottom |
| deep-ocean basin | part of ocean floor that is under deep water beyond the continent margin; composed of oceanic crust & thin layer of sediment |
| trench | long, narrow, steep depression that forms on ocean floor; result of subduction of tectonic plate; parallel to coastline, etc |
| abyssal plain | a large, flat, almost level area of the deep-ocean basin |
| core sample | a cylindrical piece of sediment, rock, soil, snow or ice that is collected by drilling |
