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Question
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
Options:
A .  current of air carry the heat away from the earth on a clear night
B .  the clear sky allows the cold of outer space to reach the earth
C .  the clear sky allows radiant energy to escape readily from the earth
D .  on a cloudy night the clouds are warm and therefore retard the cooling
Answer: Option C

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