Across
- 2. - The mixture of gases that surrounds the Earth (3 letters)
- 5. - An instrument used to measure atmospheric pressure. (9 letters)
- 6. - A measure of the amount of water vapor in the air (8 letters)
- 7. - Air can be ______. (10 letters)
- 9. - Moving air is called ______? (4 letters)
Down
- 1. - Air expands and ___ on heating (5 words)
- 3. - Air exerts _______. (8 letters)
- 4. - Air exerts pressure because it has _____ (6 letters)
- 8. - A gas essential for combustion and respiration (6 letters)