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OUTLINE THE OZONE LAYER I Introduction A What is the ozone layer B How is ozone created C How does the ozone layer work II Body A How does ozone layer depletion occur B What are CFCs C Do HFCs and HCFCs destroy ozone III Conclusion A What are some of the effects of ozone depletion B What can be done about ozone depletion What is the ozone layer The ozone layer is a layer of what is called ozone gas It is located approximately 15 to 35 above earths surface and is about 20 kilometers thick It also makes up the earths upper atmosphere the stratosphere The ozone layer is a filter that protects the earth from many of the suns harmful ultraviolet radiation Canada 1999 There are two types of ozone Good ozone is what protects us from the suns harmful UV rays Bad ozone is located near earths surface and is created from the exhaust fumes of automobiles or from other sources such as lightening Kashatus 2000 During the summer time this bad ozone causes smog in our larger cities How is ozone created Ozone which is found in the stratosphere filters the ultraviolet UV rays of the sun The physical reaction is represented by O3 UV O2 O The UV radiation energy is absorbed by O3 and the radiation breaks the molecule into two parts one being a single atom of oxygen and the other being a molecule of O2 This exchange releases the energy from the UV which means it can no longer reach the lower atmosphere The oxygen molecules O2 and O are highly reactive so these free molecules continually rejoin rejuvenating the ozone layer Heimlich 2000 Although ozone is vital to the balance of the earth ozone occurring in the lower atmosphere is harmful to breathe and can damage plant life This tropospheric ozone is formed when the
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