1. Section 24.3 Air Resources
Pages 687 to 692

2. Origin of Oxygen
The atmosphere did not originally have oxygen as part of the atmospheric composition
As early organisms used the high levels of Carbon Dioxide they produced Oxygen (photosynthesis)
Over billions of years the levles of oxygen rose

3. Notes Links The Nitrogen Cycle The Carbon Cycle Air pollution
The Carbon Cycle
Air pollution

4. Transport and Dilution
Pollutants can be transported via wind and their final location is based on the topographical structure of the land
Some pollutants can undergo reactions as they become large enough to fall to the Earth’s surface in the form of snow, mist, fog and rain

5. Assignment
Questions Page 692 # 1 to 6