Discussion
The urban heat island is the tendency for cities to be
Answer: C
Correct answer: warmer than the countryside at night
The heat island is strongest after dark and under calm clear conditions. Concrete and asphalt store the day’s heat and release it slowly, buildings restrict the sky the surface can radiate to, there is little vegetation to cool by evaporation, and heating, traffic and air conditioning add heat directly. The daytime difference is usually much smaller.
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