Across
- 3. water is composed of two
- 4. mineral found in hard water
- 5. crusty stuff that clogs pipes
- 7. ph of 14
- 8. two atoms in water
- 9. a person can live without for a week
- 10. 97% of the world's water
- 12. calcium and magnesium
- 13. gets into water from rocks
Down
- 1. word for groundwater
- 2. water regulates
- 4. mineral found in soft water
- 6. neither acid nor base
- 11. ph below 7