Across
- 1. it causes the wind to blow
- 3. cycle of evaporation, condensation and precipitation of water in nature
- 4. addition of chlorine to water to kill the germs present in it
- 6. a layer of air around the earth
Down
- 1. a method to remove insoluble impurities from water
- 2. a water-borne disease
- 5. amount of water vapour present in the air