Across
- 3. Solid state of water
- 6. A kind of microorganisms in natural water
- 8. Added to drinking water to prevent tooth decay
- 10. Solid impurities which stay on the filter paper
- 11. Change from gas state to liquid state
Down
- 1. Has a pungent smell
- 2. A method of water purification which is expensive
- 4. The liquid which passes through the filter paper
- 5. Can kill microorganisms in water, but may cause chest pain
- 7. Adding this substance helps remove some fine solid impurities suspended in water
- 9. Change from solid state to liquid state