Read the excerpt:
Cities are often several degrees warmer than the countryside around them, because concrete and asphalt absorb heat during the day and release it at night. One response is the green roof: a layer of soil and plants laid on top of a building. The plants shade the roof and cool the air as water evaporates from their leaves. Green roofs also hold rainwater, which reduces flooding in the streets below. However, they add weight, so older buildings may need to be strengthened first.
According to the excerpt, why are cities often warmer than the surrounding countryside?
Answer and explanation
Correct answer: B. Concrete and asphalt store heat
- Step 1: The excerpt explains that "concrete and asphalt absorb heat during the day and release it at night". Answer: Concrete and asphalt store heat. Why not the others: Factories, sunshine and the number of trees are not given as reasons in the excerpt.
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