| A | B |
| aphotic zone | ocean layer that receive no light |
| benthic zone | the ocean bottom |
| estuary | areas where freshwater streams and rivers meet the ocean |
| eutrophic | parts of the ocean that have a lot of nutrients |
| intertidal zone | an area of along ocean shorelines that is repeatedly covered and uncovered by ocean tides |
| neritic zone | the ocean sub area over the continental shelf |
| oceanic zone | the deep water area of the oceans |
| oligotrophic lake | lake that contains little organic matter |
| pelagic zone | the open ocean |
| photic zone | area of ocean that recieves a lot of sunlight |
| plankton | communities of small organisms that drift with the ocean currents |