Environmental Science
The deepest radiation inversion would be observed:

In polar regions in winter
On a desert in winter
In a deep valley during the summer
At the equator any day of the year
At the top of a high mountain in winter

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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:

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

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