Across
- 4. Hydrogen and Oxygen make this.
- 7. Smallest particle of an element
- 8. A slow moving mass of ice.
- 9. A group of atoms bonded together.
- 13. Measures the amount of water coming to homes.
- 14. Rain
- 15. Clean
Down
- 1. A substance in its gas phase.
- 2. A white substance.
- 3. Reach the temperature in which liquid turns to vapor.
- 5. An underground storage of water.
- 6. Gas turning to a liquid.
- 10. Liquid turning to a gas.
- 11. A compound that has been purified artificially.
- 12. The use of a chemical, physical, of biological agent to preserve something.