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