Water Systems

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Across
  1. 2. Colorless, odorless, tasteless gas; combustible
  2. 6. Rain snow sleet or hail
  3. 8. Colorless, odorless, tasteless gas; highly explosive
  4. 10. Water that contains no minerals and has a pH of 7
  5. 12. Color of number 7 on the pH scale
  6. 13. Water supply available to humans (percentage)
  7. 14. Degrees at which water becomes a solid (celsius)
  8. 15. Creates blue and green stains and scale
Down
  1. 1. The amount of earth's surface that is covered in water
  2. 3. Scale from 1 to 10 that tells how acidic or hard water is
  3. 4. Amount of water on earth that is in glacier ice
  4. 5. Contains calcium and magnesium
  5. 7. Degrees at which water becomes vapor
  6. 9. A disinfectant that is used to clean water
  7. 11. Is naturally found in water and has the chemical symbol Fe