Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds are better conductors of heat than is the clear night air
The water droplets in the clouds reflect infrared energy back to earth
The clouds absorb and radiate infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds start convection currents between them

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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 in error
The newspaper reported the wrong temperature
The thermometer was read incorrectly
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

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