Water, water, everywhere

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Across
  1. 4. disinfectant
  2. 6. Fe
  3. 8. ice is _____
  4. 11. 8-10 ph
  5. 12. salt water
  6. 13. h+h+o=?
  7. 15. we can live only a few ____ without h+h+o
Down
  1. 1. water is ______
  2. 2. we can live a few _____ without food
  3. 3. glacier ice
  4. 5. highly explosive
  5. 7. required to breathe
  6. 9. air is ___
  7. 10. fresh water
  8. 14. 6-1 ph