Air and Water

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Across
  1. 2. 21% of the air
  2. 4. ​turns​ ​blue​ ​in​ ​the​ ​presence​ ​of​ ​water
  3. 5. ​turns​ ​pink​ ​in​ ​the​ ​presence​ ​of​ ​water
  4. 7. choking smell
  5. 8. acid rain
  6. 9. 1% of the air
  7. 11. for home
Down
  1. 1. car engine
  2. 3. 78%of the air
  3. 6. leaded fuel
  4. 10. for industry