- 
  
  ozone was first identified and measured in the late 1800s. The ozone was intersting to the Scientists because the air currents in the stratosphere move the ozone around the earth.
- 
  
  The ozone form over the equator, where the rays of sunlight are the strongest, and then flows toward the poles. Then the ozone make a convenient marker to follow the flow of aor in the stratosphere.
- 
  
  A Chlorofluorocarbon is a subtance that consists of Chorine, Fluorine and carbon. They are all made in the laboratory and do not occur naturally.
- 
  
  British antarctice team measurement that the ozone layer was thinning over Antarctica
- 
  
  when the oxygen gas is exposed to ultraviolet radiation in the upper regions of the stratosphere ozone is formed