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

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Environmental Science
Which of the following helps to explain why even though northern latitudes experience 24 hours of sunlight on June 22, they are not warmer than latitudes further south?

Solar energy is spread over a larger area in northern latitudes
Some of the sun's energy is reflected by snow and ice in the northern latitudes
All of these
Solar energy is used to melt frozen soil in the northern latitudes
Increased cloud cover reflects solar energy in the northern latitudes

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