Ozone is formed in the atmosphere when energetic ultraviolet (UV) radiation dissociates molecules of oxygen, O2 , into separate oxygen atoms. Free oxygen atoms can recombine toform oxygen molecules but if a free oxygen atom collides with an oxygen molecule, it joins up, forming ozone.
It is formed by action of ultrvoilet rays on oxygen molecule nad free oxygen atom.
O2 +O - O3
Free oxygen atoms are formed also by action of ultraviolet rays.
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