Water

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Across
  1. 1. Practice of maintaining ecological balance
  2. 7. Process of removing pollution using organisms
  3. 9. Large area where all water drains to common point
  4. 11. The process by which water circulates on Earth
  5. 13. Excess heat added to water bodies
  6. 15. Water from showers and sinks
  7. 16. A naturally occurring underground water storage
  8. 17. Water held underground
  9. 18. Rain, snow, sleet, or hail
  10. 19. Combination of chemical and waste solids; sticky lumps formed from reaction with alum
Down
  1. 2. Cloudiness in water
  2. 3. Water that contains human waste
  3. 4. A large watershed drain for parts of Canada and the US
  4. 5. Removal of salt from seawater
  5. 6. A measure of salt in water
  6. 8. Ice mass covering land
  7. 10. Dirty or harmful substances in water
  8. 12. Practicing responsible use of resources
  9. 14. Water that flows over land