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  1. Ozone layer above the surface of Earth provides a shield against

    2. A.

     X-rays
    B.

     Ultra-violet rays
    C.

     Gamma rays
    D.

     Infra-red rays

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    Answer : Option B

    Explanation :

    Ozone is present in the atmosphere in small amounts, in a layer 10 to 60 kilometres above the earth (ozonosphere) and in close proximity to the ground. The ozone layer serves as protective shield against ultraviolet (UV) rays.

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