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

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by clouds

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