Science Class 5 Pollution

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

Many cities are painted white or have "green roofs" (plants on top of buildings). How does this help specifically with "Thermal" or "Heat" pollution in a city?

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A It makes the buildings look pretty so people forget the heat.
B It reflects sunlight and absorbs less heat, reducing the "Urban Heat Island" effect.
C It stops the wind from blowing through the city streets.
D It increases the amount of noise the buildings can absorb.

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Answer: B. It reflects sunlight and absorbs less heat, reducing the "Urban Heat Island" effect.

The answer is B) It reflects sunlight and absorbs less heat, reducing the "Urban Heat Island" effect, and the explanation is that dark surfaces like asphalt and black roofs trap heat; lighter or planted surfaces keep the city temperature lower and reduce energy use.

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Many cities are painted white or have "green roofs" (plants on top of buildings). How does this help specifically with "Thermal" or "Heat" pollution in a city?

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