| Answer | Crossword Clue |
|---|---|
| METHANE | Greenhouse gas produced by cows |
| UFO | It may be produced by swamp gas |
| Answer | Crossword Clue |
|---|---|
| METHANE | Greenhouse gas produced by cows |
| UFO | It may be produced by swamp gas |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.