Across
- 3. the second water need
- 4. 3% of earth's water is...
- 5. economic: demand up + supply low = ____ value
- 7. ____ = not much water
- 9. is one of the water needs
Down
- 1. no _____ = no water
- 2. cover 70% of the earth's surface
- 6. the third water need/hydration
- 8. water ____ = they are salty