| Answer | Crossword Clue |
|---|---|
| ALGA | Minuscule lake plant |
| ALGA | Minuscule lake organism |
| ALGA | Lake plant |
| oligotrophic | (esp. of a lake) Relatively low in plant nutrients and containing abundant oxygen in the deeper parts |
| eutrophic | (of a lake or other body of water) Rich in nutrients and so supporting a dense plant population, the decomposition of which kills animal life by depriving it of oxygen |
| eutrophication | Excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen |
