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  1. Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

    2. A.

     10% of the air molecules in the atmosphere
    B.

     25% of the air molecules in the atmosphere
    C.

     50% of the air molecules in the atmosphere
    D.

     75% of the air molecules in the atmosphere

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    Answer : Option C

    Explanation :

    Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly 50% of the air molecules in the atmosphere.

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