Thinning of ozone layer by cdinsah

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									        Name : _____________________________                         Chapter 9 Endangered Ecosystem
        _________________________________________________________________________________________

                                                                                             Score __ /__
       WORKSHEET 9.6 : THE THINNING OF THE OZONE LAYER                                       ____
        Fill in the blanks.




                                                           The function of the ozone layer :

                                                           Absorb _________ (UV) radiation and shield
                                                           organisms from its damaging effects




                                                Effects of ozone depletion :        Ways to reduce
                                                                                    ozone depletion:
                                                   _____ cancer
                                                   Cataracts                          Reduce or stop the
   Causes of ozone depletion:                      ________ immune system              use of ______
                                                   Rate of __________                 _______ CFCs
   ____________ or (CFC’s) in the                   decreases, reduces crop             with HCFCs
   atmosphere                                       yields
                                                   Increase the temperature
                                                    of earth and causes
                                                    ______ __________



How CFC’s destroys the ozone layer:
                                                                                        uv
                                                                                 CF2Cl2  Cl + CF2Cl
                                                                                 (CFC’s)
       _______ atoms are released when CFCs are strikes by____ rays.
       The free chlorine atom collides with an ozone molecule and               Cl + O3  ClO + O2
        combine with molecules of ______to form ___________ and
        _______ gas.
                                                                                 ClO + O  Cl + O2
       ____________ combines with one free oxygen atom to form
        chlorine atom and oxygen molecules.
       This process continues in a chain reaction




                                                                                             [14 marks]

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        WAJA BIOLOGY 2010
        JPN PERAK                                                                         6

								
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