| Answer | Crossword Clue |
|---|---|
| ALGA | Stagnant water problem |
| ALGAE | Stagnant-water buildup |
| ALGA | Stagnant water growth |
| SCUM | Top of stagnant water. |
| AMOEBA | Inhabitant of stagnant water. |
| SCUM | Surface of stagnant water. |
| BILGES | Places for stagnant water |
| BILGE | Place for stagnant water |
| STASAD | Plant growing in stagnant water. |
| ALGA | Bit of stagnant-water growth |
| GREENALGAE | Growth on wet rocks or the surface of stagnant water |
