Across
- 2. a river
- 3. where we defecate
- 5. periods of dry climate and low water levels
- 6. healthy enough to drink
- 7. too salty to drink
- 9. pass the water through membranes
- 10. caused by too much nitrogen and phosphorus in the water
Down
- 1. one way to sanitize water
- 4. cost alot of money
- 5. reduces the minerals in water
- 6. has NO additional chemicals in it
- 8. contains 2 hydrogen atoms and one oxygen atom