so scientific

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Across
  1. 2. breathing organ for a cockroach
  2. 6. solids are .......packed
  3. 7. water in form of gas
  4. 9. percentage of oxygen
  5. 10. breathing organ for a fish
  6. 12. ice
Down
  1. 1. liquid
  2. 3. gas is .......compressible
  3. 4. air or water vapour
  4. 5. water droplets cooling down
  5. 8. percentage of dust and water vapour
  6. 11. liquids are packed .......