Across
- 2. clear sunny skies; fair weather (3 words; no space)
- 5. cloudy skies; possibly precipitation (3 words; no space)
- 9. virtually all weather occurs here
- 10. most abundant gas in the atmosphere
- 11. as altitude _____, air pressure decreases
- 12. tool used collect air pressure data
Down
- 1. unit to measure air pressure
- 3. temperature increases with altitude in this layer
- 4. a person who studies weather
- 6. makes up 21% of air
- 7. force that pulls down air molecules
- 8. as altitude _____, air pressure increases