AIR AROUND US

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Across
  1. 1. process of making food (plants)
  2. 5. It should not be burned as it produce too much pollution
  3. 6. gas which has major composition in air
  4. 8. mixture of gases
  5. 10. needed for plants
Down
  1. 2. produced when fuel is burned
  2. 3. used for electricity
  3. 4. important for water cycle
  4. 7. human /animals inhale it
  5. 9. layer of air