Environmental Science
Suppose yesterday morning you noticed ice crystals (frost) on the grass, yet the minimum temperature reported in the newspaper was only 35o F. The most likely reason for this apparent discrepancy is that:

The thermometer was read incorrectly
The thermometer was in error
The thermometer was read before the minimum temperature was reached for that day
Temperature readings are taken in instrument shelters more than 5 feet above the ground
The newspaper reported the wrong temperature

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Environmental Science
At night, low clouds:

Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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