Across
- 2. underground, water-bearing, geologic structure
- 5. chemical needed to sustain life
- 6. water with a salt content too high for drinking but not as salty as the ocean
- 9. causes limited life span of large dams
- 10. bacteria in the roots of legumes convert N2 into ammonia
- 12. most water efficient method of watering plants
- 13. household waste water from showers and laundry
- 15. process used to kill bacteria and viruses in waste water treatment
- 18. removal of salt from water
Down
- 1. natural nutrient enrichment of a river where it flows into a lake or ocean
- 3. water that has a low salt content
- 4. legislation that limits water pollution
- 7. tank used to store water
- 8. top of saturated zone
- 11. land area that drains into a river
- 14. dense growth of algae caused by large limiting nutrient influx
- 16. oil or natural gas extracted from shale deposits
- 17. water that is fit to drink