| Answer | Crossword Clue |
|---|---|
| OZONE | Blue gas in the greenhouse effect |
| ESSO | Red-letters-in-a-blue-oval gas logo |
| Answer | Crossword Clue |
|---|---|
| OZONE | Blue gas in the greenhouse effect |
| ESSO | Red-letters-in-a-blue-oval gas logo |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.