Across
- 4. If something is below a seven on the PH scale it is this.
- 5. This type of UV ray is the only one that is harmless to humans.
- 7. Each number down on the PH scale represents a __ times increase in acidity.
- 8. This form of pollutant is released into the air directly in the form that is the pollutant.
- 9. This word is a combination of smoke and fog.
- 10. Infrared rays break apart chemicals by making them do this.
- 12. How many different categories are there of air pollution?
Down
- 1. Where does carbon last the longest?
- 2. The ozone layer resides in this layer of the earth's atmosphere.
- 3. The IPCC puts together a climate report every _____ years.
- 6. NO is this colour.
- 11. This is the index that is used for measuring the quality of air.