What is in the air?

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Across
  1. 1. when a plant uses water sunlight and carbondioxide for food and generates oxygen
  2. 5. forms 78 percent of the worlds atmosphere
  3. 6. a gas that cannot be liquified
  4. 9. ghg that is emitted by burning fossil fuels
  5. 10. flammable and is used as fuel worldwide
  6. 12. a property of the physical body
  7. 13. multiple gases that all go as a whole
  8. 16. a toxic gas with bad odor that is formed by ultraviolet light
Down
  1. 2. also known as heat energy
  2. 3. essential to living creatures
  3. 4. can be produced by boiling liquids
  4. 7. carbondioxide methane nitrousoxide
  5. 8. the most stable of gases
  6. 11. gasses surrounding the earth
  7. 14. mostly gas but is also 21 percent of the atmosphere
  8. 15. they control our environment