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  1. Ozone layer is present in

  2. A.

     Troposphere

    B.

     Ionosphere

    C.

     Stratosphere

    D.

     Exosphere

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    Answer : Option C

    Explanation :

    Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.


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