Across
- 3. removing harmful bacteria and microbes from water
- 4. a body of rock or sediment that can store a lot of water
- 7. when waste or other material causes water to become harmful to organisms
- 8. growth of town and cities due to people moving from rural to urban area
- 9. water under earths surface in space in rock or soil; can be liquid or frozen
- 10. occurs when live or dead organisms are added to water supplies
- 11. overuse of groundwater causes seawater to sleep in aquifers,contaminating water supplies
- 12. one specific site of pollution
- 13. an increase in the amount of nutrients in water
- 14. any heating of natural water that results from human activity
Down
- 1. when harmful chemicals are added to water supplies
- 2. water that is suitable to drink
- 5. body of water above the ground
- 6. many small sources of pollution
- 12. frozen layer of soil in polar regions
- 15. a body of water that usually forms behind a dam