Across
- 2. Frozen layer of soil in polar regions
- 4. Any heating of natural water that results from human activity
- 8. A body of rock or sediment that can store a lot of water
- 10. When waste or other material causes water to become harmful to organisms
- 13. Body of water above the ground
- 14. One specific site of pollution
Down
- 1. Water under Earths surface in rock or soil
- 3. Removing harmful bacteria and microbes from water
- 5. Many small sources of pollution
- 6. When harmful chemicals are added to water supplies
- 7. Overuse of groundwater causes seawater to seep in aquifers , contaminating water supplies
- 9. Occurs when live or dead organisms are added to water supplies
- 11. A body of water that usually forms behind a dam
- 12. Water that is suitable to drink
- 15. Growth of towns and cities due to people moving from rural areas to urban area
- 16. An increase in the amount of nutrients in water