Across
- 1. 97% of earths water is
- 3. When oxygen and hydrogen mixes together it creates this
- 5. water freezes at 32 degrees
- 6. Boiling water over a fire was a way to clean
- 7. These people were the first to record methods of treating water
- 8. this is water vapor becoming a liquid or solid
- 12. This is a type of fresh water
- 13. The two chemicals that makes water hard are calcium
Down
- 2. A water source under the ground
- 3. this is highly explosive
- 4. This is rain, snow, sleet, or hail
- 9. This is combustible
- 10. First country to use chlorine in water
- 11. This is 70% water
- 14. Water turns to this when it freezes