Environmental Science
When the air temperature is below freezing, the saturation vapour pressure over water is .

Equal to the saturation vapour pressure over ice
Equal to zero
Less than the saturation vapour pressure over ice
Greater than the saturation vapour pressure over ice

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

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

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