Across
- 3. removing bacteria & microbes from water
- 5. water that is suitable to drink
- 6. water above ground
- 7. one specific site of pollution
- 13. frozen soil in polar regions
- 14. material that makes water harmful
- 15. growth of towns due to moving from rural to urban areas
Down
- 1. live or dead organisms added to water
- 2. water under the surface in rocks or soil
- 4. when chemicals are added to water
- 8. many small sources of pollution
- 9. seawater seeps into aquifers, contaminating the water
- 10. water that forms behind a dam
- 11. increase of nutrients in water
- 12. heating of natural water from humans
- 16. rock that can store water