On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

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The clear sky allows radiant energy to escape readily from the earth

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Current of air carries the heat away from the earth on a clear night

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The clear sky allows the cold of outer space to reach the earth

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On a cloudy night the clouds are warm and therefore retard the cooling

Q. On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

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