Environmental Science
The percentage of water vapour present in the air compared to that required for saturation is the:

Specific humidity
Dew point
Mixing ratio
Absolute humidity
Relative humidity

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

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

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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
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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