AIR AROUND US

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Across
  1. 4. exchange of oxygen and carbon dioxide in living organisms
  2. 6. moving air
  3. 8. farmer’s friends
  4. 10. 78%of air
Down
  1. 1. layer of air around earth
  2. 2. a gaseous mixture
  3. 3. nitrogen of the air is used to manufacture this
  4. 5. supports combustion
  5. 7. dioxide component of air used by green plants to make their food
  6. 9. uses windpower to rotate