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
Greater than the saturation vapour pressure over ice
Less than the saturation vapour pressure over ice

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Environmental Science
An important reason for the large daily temperature range over deserts is:

Dry air is a very poor heat conductor
The ozone content of desert air is very low
Free convection cells are unable to form above the hot desert ground
The light-colored sand radiates heat very rapidly at night
There is little water vapor in the air to absorb and re-radiate infrared radiation

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