Across
- 2. pollution that forms over cities
- 5. caused sculpture damage in Greece (461)
- 6. this layer scatters (harmful) UV rays
- 9. the lowest layer of the atmosphere, contains "weather"
- 12. only certain kinds of these can use atmospheric nitrogen (453)
- 13. large body of air
- 14. the atmosphere is composed of 78% _?_ (452)
- 16. _?_ practices can strip plants from the soil (462)
- 18. this instrument measures air pressure (455)
- 20. combines chemically with fuel such as wood, gasoline (453)
- 22. transfer of energy by movement of fluids
- 24. a type of precipitation lace with acid that can be harmful (467)
Down
- 1. primary air pollutant (463)
- 3. air _?_ is the force exerted by air on the area below it
- 4. thin layer of gases that surrounds earth
- 7. extends 11-50 km above sea level and holds pollutants
- 8. transfer of energy by contact
- 10. the transfer of energy through space
- 11. the atmosphere transports and recycles _?_ (452)
- 15. these conditions can result from air pollutants (464)
- 17. _?_ air can hold more water vapor than cold air (454)
- 19. _?_ humidity is a ratio of water vapor that the air can hold
- 21. water vapor becomes liquid in this process (454)
- 23. warm air is less dense than _?_ air