page+461+Q+20

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 * 1) 20 a) It says in the text, that "Cities are known to be urban heat islands, with temperatures that are often higher than in surrounding rural and natural vegetated areas." I think this states that cities absorb heat energy from the sun, so the albedo would be higher in a city, causing it to be warmer.

b) If I understood the question correctly, It asks "What material would you use to make the plaza colder" In that case, I would use white rock. In the case that I am wrong, I would use asphalt.

c) white rock is... white, therefore it would reflect heat better than the other two because they are darker, and darker objects absorb light better than light objects.

d)it would be Tar.

e)The Tar would take longer to cool down, because it would get hotter and the pale shingles, and would therefore take longer to cool.

f) When one brick gets warm, it warms up the bricks beside it. Eventually, the heated bricks at the edge of town warm up the soil around the city. Also, the bricks on the outside heat even the inside of a cooled building.

g) The sun heats the earth, and the earth heats the air above it. The air moves upwards, and is replaced from cool air from elsewhere. The cool air is heated, and is sent upwards. this results in a constant thermal above the city while the city releases it's heat over the night.