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

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

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Environmental Science
Our seasons are caused by:

All of these
The angle at which sunlight reaches the earth
The length of the daylight hours
Only (b) and (c) are correct
The changing distance between the earth and the sun

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