What causes the "heat island" effect?

a.

heat produced from a large number of people

b.

the materials used in building cities retain heat

c.

the large amount of reflected light from glass windows

d.

all of the above

The heat island effect, or urban heat island effect, is when an isolated region of land is significantly warmer than its surroundings due to human activities. These activities include the usage of materials that are dark or absorb significantly large amounts of heat. These materials retain the heat that is incident on them; therefore, the entire region exhibits a significantly elevated temperature when compared to an area with less buildings and more vegetation. Therefore, the answer is B. the materials used in building cities retain heat.

The answer is A. An urban heat island is an urban range or metropolitan region that is essentially hotter than its encompassing rustic regions because of human exercises. The primary driver of the urban warmth island impact is the alteration of land surfaces.