Environmental Science
Which statement(s) below is/are correct?

Without the summer fog along the coast of California, redwoods would not grow well there
All of these
Valleys are more susceptible to radiation fog than hill tops
Fog can be composed of ice crystals

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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:

75% of the air molecules in the atmosphere
25% 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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