m38.     Why is ozone being depleted?

Man is used to better living through chemistry. One polystyrene cup adds 1-billon CFC molecules to the stratosphere, which will destroy 100 trillion molecules of ozone (See Figure 05: Ozone in the Atmosphere). Bromine containing compounds destroy hundreds of times more ozone than CFCs. HBFC, and halons are used in fire extinguishers. Methyl bromide is used in pesticides. Carbon tetrachloride is an inexpensive solvent. Methyl chloroform or 1,1,1-trnchloroethane is found in clothes cleaning funds, propellant for aerosols, correction fund, spray adhesives and more than 160 other consumer products.

g01.    What was the second atmosphere like?

g02.    What was the primitive atmosphere like?

g03.    How did the atmosphere change after the Precambrian?

g15.    What are ozone holes and where are they?