Environmental Science
The cold feeling that you experience after leaving a swimming pool on a hot, dry, summer day represents heat transfer by:

Radiation
Latent heat
Conduction
Convection

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

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