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:

75% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere

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Environmental Science
When a liquid thermometer is held in direct sunlight,

It will measure a much higher temperature than that of the air
It will measure the temperature of the sun rather than the air
It will measure a much lower temperature than that of the air
It will accurately measure the air temperature

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