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  1. The 99% mass of earth atmosphere is confines to the height of:

    2. A.

     16 Km from the Earth’s surface
    B.

     32 Km from the Earth’s surface
    C.

     64 Km from the Earth’s surface
    D.

     72 Km from the Earth’s surface

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    Answer : Option B

    Explanation :

    Although our atmosphere extends upward for many hundreds of kilometers, 99% of the atmosphere's mass is confined within a 30 km of the earth's surface.

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