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:

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

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Environmental Science
When the air is saturated, which of the following statements is not correct?

The air temperature equals the dew point temperature
The wet bulb temperature equals the dew point temperature
The relative humidity is 100 percent
The air temperature equals the wet-bulb temperature
An increase in temperature will cause condensation to occur

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