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  1. In upper layer of atmosphere ozone is formed by

    2. A.

     The action of ultraviolet rays on oxygen
    B.

     The combination of oxygen molecules
    C.

     Subjecting oxygen to high pressure
    D.

     The action of nitrogen on oxygen in atmosphere

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    Answer : Option A

    Explanation :

    In upper layer of atmosphere ozone is formed by the action of ultraviolet rays on oxygen.

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