Across
- 3. unwanted substances
- 6. used to kill plants
- 8. not clear
- 10. used to kill animal pests
- 11. contains feces and urine
- 12. artificially raising the temperature
Down
- 1. amount of solute in solution
- 2. removing salts and minerals from water
- 4. underground pipes carrying used water
- 5. using living things to remove contaminants
- 7. used bath water
- 9. an area where water collects