Environmental Science
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
10% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere

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Environmental Science
In a temperature inversion:

Air temperature decreases with increasing height
Air temperature increases with increasing height
It is warmer at night than during the day
Air temperature remains constant with increasing height

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