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Assertion (A): Ozone ($\ce{O3}$) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen ($\ce{O2}$).
Reason (R) : The amount of ozone in the atmosphere began to drop sharply in 1980s.
Reason (R) : The amount of ozone in the atmosphere began to drop sharply in 1980s.
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(B)Both A and R are true but R is not the correct explanation of A.