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

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
Saturation vapor pressure decreases with increasing altitude

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Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Conduction of heat upward from a hot surface
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface
Heat energy from the earth's interior

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