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When does dew usually form?

Answer and explanation

Correct answer: At night or early morning

Direct answer: B, at night or in the early morning. After sunset, the ground and exposed objects can lose heat and cool. If a surface becomes cool enough, nearby water vapour condenses into tiny liquid droplets on it; these droplets are called dew. B is correct because nighttime cooling commonly allows this process, and dew is often noticed on grass early in the morning. A is wrong because noon usually brings stronger heating, which tends to evaporate droplets rather than form them. C is wrong for the same reason: bright sunshine generally warms a surface and can remove dew. D is wrong because a desert afternoon is normally hot and dry, conditions that do not generally favour dew formation. Local conditions can vary, but cooling and a moist-enough layer of air are essential ideas. Memory cue: dew is condensation on a cool surface, usually noticed after a clear, cool night.

Related tags

DewCondensationNight CoolingWater VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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