| A | B |
|---|
| Wetland | an area where land is periodically underwater |
| Mangrove trees | grow in mangrove swamps |
| estuary | the area where a river meets the ocean |
| estuary | the area where a river meets the ocean |
| excess nutrients | can cause an explosion of plant algae and bacteria called eutrophication |
| eutrophication | excess nutrients in a lake which causes an explosion of plant algae and bacteria |
| benthos | bottom-dwelling animals such as mussels, clams, and barnacles |
| littoral zone | the shallow margin where photosynthesis takes place |
| plankton | organisms that drift |
| nekton | free-swimming organisms, such as fish and turtles |
| salt marsh | is an ecosystem that develops in an esturary and is dominated by marsh grasses |
| barrier island | thin island that protects the shore from erosion |
| wetland | an area of land covered by water for at least part of the year |
| coral reef | limestone ridges built by corals |
