Environmental Science
"Ozone Hole" is a _____________

Hole in the hydrosphere
Hole in the troposphere
Hole in the atmosphere
Destruction of ozone layer

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Environmental Science
During an equinox:

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

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

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