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

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Environmental Science
Assuming that the night will remain clear, calm, and unsaturated, the predicted minimum temperature is 32oF. Suddenly the wind speed increases and remains gusty throughout the night. The minimum temperature will most likely be:

Much lower than predicted due to radiational cooling
Higher than predicted due to the release of latent heat
About the same as predicted but will occur earlier in the night
Higher than predicted due to mixing

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Environmental Science
An important reason for the large daily temperature range over deserts is:

Free convection cells are unable to form above the hot desert ground
The light-colored sand radiates heat very rapidly at night
Dry air is a very poor heat conductor
There is little water vapor in the air to absorb and re-radiate infrared radiation
The ozone content of desert air is very low

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