B2 2020 Hurst

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Across
  1. 4. Synthetic greenhouse gases
  2. 6. Most dense layer of the atmosphere
  3. 9. The most common greenhouse gas
  4. 11. Trapping gases in the atmosphere
  5. 16. How plants create oxygen
  6. 17. Makes up 21% of atmospheric gases
  7. 18. A greenhouse gas also known as natural gas
  8. 21. The gradual heating of earth's surface
  9. 22. Gas from agricultural/industrial activity
  10. 23. Greenhouse gas caused by human activity
  11. 24. Made to be like something
  12. 25. Absorbs most of the harmful radiation
Down
  1. 1. Plants absorbing CO2
  2. 2. Largest source of greenhouse gas emissions
  3. 3. How long a substance stays in a system
  4. 5. Most abundant gas in the atmosphere
  5. 7. Human activity that offsets greenhouse gases
  6. 8. Gases that destroy the ozone layer
  7. 10. Includes the ozone layer
  8. 12. Heat transfer through electromagnetic waves
  9. 13. Gas released into the atmosphere
  10. 14. Cause of CO2 emissions
  11. 15. Above the stratosphere
  12. 19. Emit pollutants that harm the atmosphere
  13. 20. Has four layers that have gases