Environmental Science
At which city might you be able to observe cirrus clouds at an altitude of 3,000 m (10,000 feet) above the surface?

Honolulu, Hawaii
Chicago, Illinois
Barrow, Alaska
Miami, Florida

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Environmental Science
During an equinox:

The earth is not tilted toward nor away from the sun
All of these
At noon the sun is overhead at the equator
The days and nights are of equal length except at the poles

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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:

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

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