The urban heat island effect refers to cities being significantly warmer than nearby rural areas. This occurs because concrete and asphalt absorb heat,vegetation is reduced and waste heat is released from buildings and vehicles. The stem mentions higher temperatures in built up city areas relative to rural surroundings,which is the classic definition of a heat island. Therefore “heat island” is the correct term.
Option A:
Cool island would mean the city is cooler than its surroundings,which is opposite to the observed phenomenon. Urban areas are generally warmer,so this term does not fit the description in the question.
Option B:
Heat island captures the concentration of heat in urban cores caused by surface properties and human energy use. It matches exactly the pattern of higher city temperatures compared to rural areas described in the stem.
Option C:
Fog island is not a standard climatological concept linked to urbanisation. It does not describe temperature differences caused by built up surfaces and therefore is not appropriate here.
Option D:
Rain island is sometimes used informally to suggest altered rainfall patterns,but it is not the recognised term for the temperature effect described. It would confuse rather than clarify the concept in the stem.
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