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

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Minimum and maximum temperature for a day
Sunrise and sunset
Minimum and maximum solar energy received at the surface for a given day
Time of maximum solar radiation and the time of maximum temperature
Time of minimum temperature and the time of maximum solar radiation

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