B3 2020 Howell

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Across
  1. 6. chemical formula for carbon dioxide
  2. 7. gases in the atmosphere that absorb infared radiation
  3. 8. chemical symbol for water vapor
  4. 9. greenhouse gases banned in 1978
  5. 12. greenhouse gas emitted naturally by wetlands
  6. 14. atmosphere layer with ozone layer
  7. 17. number of greenhouse gases
  8. 18. the rising of global temperatures
  9. 19. when burnt these create carbon dioxide
  10. 20. greenhouse gases only emitted by humans
  11. 22. greenhouse gas that comes from ozone in the troposphere
  12. 23. where weather happens
Down
  1. 1. the cutting down of trees that releases carbon dioxide
  2. 2. when greenhouse gases keep too much heat in
  3. 3. second most abundant gas in the atmosphere
  4. 4. most abundant gas in the atmosphere
  5. 5. lights that occur naturally in the thermosphere
  6. 9. primary greenhouse gas emitted by humans
  7. 10. percent of oxygen in the atmosphere
  8. 11. earth's coldest layer
  9. 13. earth's outer layer
  10. 15. solar radiation can be reflected back to ___
  11. 16. the process of gases trapping solar energy in earth
  12. 17. percent of nitrogen in the atmosphere
  13. 21. type of radiation greenhouse gases absorb