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

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Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which rates of evaporation and condensation on the earth are in balance
The temperature at which the earth is radiating energy at maximum intensity
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The average temperature the earth must maintain to prevent the oceans from freezing solid

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