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