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  1. The thickness of biosphere is

    2. A.

     8-10 km above the earth's surface
    B.

     5-8 km above the earth's surface
    C.

     5-10 km above the earth's surface
    D.

     10-12 km above the earth's surface

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    Answer : Option A

    Explanation :

    The thickness of biosphere is 8-10 km above the earth's surface.

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