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Question
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:
Options:
A .  50% of the air molecules in the atmosphere
B .  10% of the air molecules in the atmosphere
C .  75% of the air molecules in the atmosphere
D .  25% of the air molecules in the atmosphere
Answer: Option A

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