Across
- 8. are bodies of densely packed slowly melting snow
- 9. lined canals
- 10. is used water from showers, sinks, dishwashers, and clothes washers
- 12. these spaces are completely filled with fresh water
- 13. is fresh water that is used to produce food and other products
- 14. involves using pipes or tubes to deliver water directly to plant roots
- 15. overnourishment of aquatic ecosystems with plant nutrients(mostly nitrates and phosphates) resulting from human activities such as agriculture, urbanization, and discharge from sewage treatment plants
- 16. surface of water that generally can be counted on as a stable source of fresh water from year to year and represents one third of total runoff
Down
- 1. water is pumped from a groundwater or surface water source into unlined ditches and flows by gravity to crops
- 2. area at the top of the zone of saturation where water rises and falls according to the weather and human intervention
- 3. is a rough measure of the volume of fresh water you use directly and indirectly to support your lifestyle
- 4. is the process of removing dissolved salt from ocean water or from brackish (slightly salty) water in aquifers or lakes
- 5. occurs when the land above an aquifer subides, or sinks
- 6. artificial lake behind a dam
- 7. is any water that contain sewage and other wastes from homes and industries
- 11. is any change in water quality that can harm living organisms or make water unfit for human uses such as drinking, irrigation, and recreation