The Fire Triangle

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Across
  1. 3. The type of air that we breathe out
  2. 4. Petrol is used as a ____ to cars
  3. 6. To put out a fire you ___ it
  4. 7. This comes from fire
  5. 9. A mix of hydrogen and carbon dioxide
  6. 10. The type of air that we breathe in
  7. 11. The fire is ____ the paper
Down
  1. 1. This is a type of fuel
  2. 2. The topic this crossword is on
  3. 5. 70% of the world is ___
  4. 8. Three elements are needed to make a ___