| Answer | Crossword Clue |
|---|---|
| SCUM | Stagnant pond surface |
| SCUM | Stagnant-pond topping |
| SLIME | Feature of a stagnant pond |
| SCUM | Surface of stagnant water. |
| GREENALGAE | Growth on wet rocks or the surface of stagnant water |
| SCUM | Pond surface |
| ICE | Frozen pond surface |
| ALGAE | Pond surface growth |
| SCUM | Icky pond surface |
| SCUM | Pond surface, perhaps |
