Across
- 3. the amount of salt in water
- 5. a layer of gasses that surround the earth
- 10. removing salt from water for drinking
- 11. a chemical used to help keep water clean
- 12. typically undergroung; sewage is collected here
- 13. flooded areas of land
- 14. thinking about the way we use resources for the future
- 16. these make water less suitable for drinking
- 19. Removing chemicals, bacteria for consumption
- 20. water that is found beneath the earth's surface
- 21. a place underground after the soil
Down
- 1. a change in the normal climate's temperature
- 2. flowing bodies of water
- 4. land that drains its water into a nearby body of water
- 6. A human-made way to supply water to plants, crops
- 7. a technique to clean water using microorganisms
- 8. very large bodies of water
- 9. a method of obtaining water from the ground
- 15. a compressed mass of snow, rock, or sediment
- 17. a body of undergrounf rock/sediment that holds groundwater
- 18. the natural process in which water is recycled