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:

75% of the air molecules in the atmosphere
10% 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
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

Cooler summers and milder winters than at present
Cooler summers and colder winters than at present
Hotter summers and milder winters than at present
Hotter summers and colder winters than at present
No appreciable change from present conditions

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear to have more vertical development than is actually the case
Appear lighter in color than is actually the case
Appear closer together than is actually the case
Appear farther apart than is actually the case

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