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
Thermal belts are:

Pockets of warm air resting on a valley during the afternoon
Cold, below-freezing air found at the top of a mountain
Pockets of cold air resting on a valley floor at night
Warmer hillsides that are less likely to experience freezing conditions

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