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heat island| Large town or city that is warmer than the surrounding countryside. The difference in temperature is most pronounced during the winter, when the heat given off by the city's houses, offices, factories, and vehicles raises the temperature of the air by a few degrees. The heat island effect is also caused by the presence of surfaces such as black asphalt, that absorb rather than reflect sunlight, and the lack of vegetation, which uses sunlight to photosynthesise rather than radiating it back out as heat energy. |
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