Discussion
Consider the following statements about the urban heat island.
1. Thermal mass of buildings and pavement stores heat during the day.
2. Reduced vegetation means less evaporative cooling.
3. The effect is largest at midday on a sunny afternoon.
Answer: A
The first two are correct. The third is wrong, since the difference is greatest at night when the city releases its stored heat while the countryside cools freely. Night is when the gap is widest. Stored heat is released after dark.
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