Science Crossword Puzzle

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Across
  1. 2. the most abundant greenhouse gas
  2. 3. made up of nitrogen and oxygen
  3. 7. Doesn't react easily with other gases
  4. 8. 21 percent of air
  5. 9. o3
  6. 11. heat
  7. 13. 1 carbon and 2 oxygen atoms
  8. 14. trap thermal energy
Down
  1. 1. The amount of the element stays constant
  2. 3. layer of gases that surrounds planets or stars
  3. 4. the process of plants turning light into food
  4. 5. cattle process it in their digestive process
  5. 6. 78 percent of air is this gas
  6. 10. changes with a change in the environment
  7. 12. weight