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The ozone layer is a region in Earth’s stratosphere that contains high concentrations of a bluish gas called ozone. Although ozone constitutes only about one- million of the atmosphere’s gases. It absorbs most of the sun’s ultraviolet radiations. Without the Ozone layer, this radiation would destroy all life on the surface of the planet.
Ultraviolet radiation creates and perpetuates ozone. When an ozone molecule is struck by an ultraviolet ray, it falls apart, yielding free oxygen and an oxygen atom that combines with another free oxygen to form more ozone. this cycle absorbs most UV radiations.
Some manufactured chemicals interfere with this cycle, thus reducing the amount of ozone in the stratosphere. among the worst offenders are Chlorofluorocarbons (CFCs), usually found in refrigerants and aerosol sprays and now generally banned.