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

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Environmental Science
During an equinox:

All of these
At noon the sun is overhead at the equator
The days and nights are of equal length except at the poles
The earth is not tilted toward nor away from the sun

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