1st: 2020: Wassell

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Across
  1. 5. A continental landmass
  2. 6. Makes up 78% of earths atmosphere
  3. 7. A rock which can be burned into a fossil
  4. 9. A liquid derived from petroleum
  5. 11. The act of heat increasing
  6. 13. A gas that absorbs and emits energy
  7. 14. Combination of elements or qualities
  8. 17. Causes global warming with toxic fumes
  9. 19. The envelope of gases surrounding earth
  10. 20. A colorless unstable toxic gas
  11. 22. A powerful greenhouse gas, flammable
  12. 23. Also known as laughing gas
Down
  1. 1. Region of ozone formation in the atmosphere
  2. 2. High density that occurs naturally in the
  3. 3. A property that is transferred to an object
  4. 4. The emission of energy in forms of waves
  5. 5. Fuels create this in the air, harmful
  6. 8. Makes up 21% of earths atmosphere
  7. 10. Big piles of trash that harm air
  8. 12. First layer above earths surface
  9. 15. The highest layer in the atmosphere
  10. 16. A state of matter with no fixed shape
  11. 18. Coldest layer in the atmosphere
  12. 19. Envelope of gases surrounding the earth
  13. 21. An energy source produced by humans