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

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

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Environmental Science
Frost forms when:

All of these
Objects on the ground cool below the dew point temperature.
Water vapor changes into ice without first becoming a liquid.
The dew point is 32oF or below.

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