Across
- 4. Growth of towns and cities due to people moving
- 5. Waste causes water to become harmful
- 6. A body of water that usually forms behind a dam
- 8. When harmful chemicals are added to water
- 9. Removing harmful bacteria and microbes from water
- 10. Water under Earths surface
- 11. Many small sources of pollution
- 14. A body of rock or sediment that can store water
- 15. Any heating activities of natural water
Down
- 1. Frozen layer of soil in polar regions
- 2. When live or dead organisms are added to water
- 3. Contaminating water supplies
- 7. One specific site of pollution
- 12. Water that is suitable to drink
- 13. Body of water above the ground
- 16. An increase in the amount of nutrients in water