| A | B |
|---|
| oceanographer | a scientist who studies the oceans |
| bathyscaphe | a special boat that can dive very deep and withstand largeb |
| echo | a sound that bounces off an object |
| echo sounder | an instrument that uses echo to measure ocean depths |
| mixed layer | a layer of water in the ocean next to the surface where the water is well mixed |
| thermocline | a layer of water in the ocean below the mixed layers where the water temperature drops sharply with depth |
| salinity | the amount of salt and other dissolved minerals in ocean water |
| dilute | to make a solution weaker |
| continental shelf | the edge of the continent that slopes gently under the ocean water |
| trenches | very deep canyons in the ocean basin |
| seamount | a mountain peak that rises from the ocean floor but does not show above the ocean surface |
| guyot | a seamount with a flat top |
| ooze | ocean basin sediments formed from the shells and skeletons of microscopic life |
| ocean currents | rivers of water flowing through the ocean |
| density currents | currents that move up and down in the ocean |
| organism | a living thing |
| marine | living in the ocean |
| plankton | tiny, floating marine organisms |
| diatoms | plant plankton |
| nekton | free-swimming sea animals |
| benthos | plants and animals that live on the ocean floor |
| environment | everything around you |
| pelagic division | the waters of the ocean |
| benthic | the entire ocean floor |
| neritic zone | the ocean region from the shore to the end of the continental shelf |
