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  1. What is the reason of duration of cold wave in America?

    2. A.

     Bio-diversity and Habitat
    B.

     Climate and Energy
    C.

     Political Administration
    D.

     Polar Vortex

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    Answer : Option D

    Explanation :

    Polar Vortex is low pressure area lying in the Upper Tropospheric level near Earth's pole. The Southward shifting of such a low pressure area bring cold waves in America in winter.

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