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The ozone molecule is unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O 2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle.
Stratospheric ozone is natu-rally formed in chemical reactions involving ultravioletsunlight and oxygen molecules, which make up 21% ofthe atmosphere. In the first step, sunlight breaks apartone oxygen molecule (O 2) to produce two oxygen atoms(2 O) (see Figure Q2-1).n the strat-osphere, the process begins with an oxygen molecule (O 2) being broken apart by ultraviolet radiation fromthe Sun. In the lower atmosphere (troposphere), ozone is formed in a different set of chemical reactionsinvolving hydrocarbons and nitrogen-containing gases. Stratospheric Ozone Production.