The ozone layer in the
stratosphere is a natural feature of the earth's environment. The ozone layer
exists between 20 and35 km above the earth's surface. This layer protects the
earth from the harmful effects of the ultraviolet radiation of the sun.
A depletion of ozone layer is
considered as a serious threat to all forms of life on the earth. A 5% decrease
in ozone concentration could increase the incidence of skin cancer by 20%.
Ultraviolet radiation is also a factor in disease of the eye, including
cataract formation. It can cause genetic mutations and destroy crops and other
forms of vegetation. Aquatic animals and aquatic plants are greatly affected by
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