Environmental Science
"A good absorber of a given wavelength of radiation is also a good emitter of that wavelength." This is a statement of:

Kirchoff's Law
Stefan-Boltzmann's law
The First Law of Thermodynamics
The Law of Relativity
Wien's Law

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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:

10% of the air molecules in the atmosphere
50% 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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