Environmental Science
In the northern hemisphere, the number of hours of daylight begin to shorten after the

Spring equinox
Winter solstice
Summer solstice
Autumn equinox

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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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