| Answer | Crossword Clue |
|---|---|
| XENON | Gas present in the Martian atmosphere |
| XENON | Gas in the atmosphere |
| ARGON | Common inert gas in the atmosphere |
| ARGON | Most common inert gas in the atmosphere |
| ARGON | Third-most common gas in the atmosphere |
| ARGON | Most abundant noble gas in the atmosphere |
| ARGON | Third-most abundant gas in the atmosphere |
