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The Thinning of The Ozone Layer


Mind Map on The Thinning of The Ozone Layer, created by oitt_aa on 09/22/2013.
Mind Map by oitt_aa, updated more than 1 year ago
Created by oitt_aa almost 9 years ago

Resource summary

The Thinning of The Ozone Layer
  1. The Ozone Layer
    1.  The ozone layer is located on earth’s stratosphere which contain relatively high concentration of ozone ( a molecule made up of three oxygen atoms).
      1.  The ozone layer is crucially important to life because it absorbs biologically harmful ultraviolet (UV) radiation from the sun.
      2. Ozone Depletion
        1.  The thinning of the ozone layer is blamed on the increase in CFCs.
          1.  CFCs are used as coolants in refrigerators and air conditioners as aerosol propellants and in foam plastics production.
            1.  CFCs release chlorine atoms when reacting with solar radiation at high altitudes.
              1.  The chlorine atoms then cause ozone molecules to break down. Chlorine atoms can remain in the stratosphere in 100 years, constantly and repeatedly breaking down ozone molecules.
                1.  A thinning ozone layer will lead to increased UV radiation reaching the earth’s surface.
                  1.  This will cause an increase in incidence of cataracts and skin cancers in humans as it increases mutation rates.
                    1.  It also suppresses the immune system of animals and humans, and also damages plants and phytoplantonks.
                      1.  The use of CFCs is being phased out under the terms of the Montreal Protocol, 1987.
                        1.  The Montreal Protocol is an international agreement that control the production and consumption of Ozone-Depleting Substances ( ODSs) such as chlorofluorocarbon (CFCs).
                          1.  ODSs are also gases that contribute to global warming.
                            1.  CFCs are currently being replaced by HFC molecules which do not break down ozone, and HFCs which has a low ozone breakdown potential (HCFs will be phased out by 2030).
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