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
The wind direction is:

Always directly from high toward low pressure
The direction to which the wind is blowing
The direction from which the wind is blowing
Always directly from low toward high pressure

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