Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

Water boils at a higher temperature with higher altitude
Saturation vapor pressure decreases with increasing altitude
There is less oxygen in the air at high altitude
The temperature of the boiling water decreases with increasing altitude

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