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Which process can begin due to radiational cooling of the ground at night?

Answer and explanation

Correct answer: Condensation, which may form dew or fog

Correct answer: A, condensation, which may produce dew or fog. At night the ground loses heat by radiation and becomes cooler. The air touching the ground is then cooled from below. If its temperature falls to the dew point, the air reaches saturation and water vapour begins to condense. On a surface this may form dew; when tiny droplets remain suspended near the ground, fog may develop under suitable conditions. Option B is not the best answer because evaporation generally needs energy and is not the direct process initiated by nocturnal cooling. Option C is wrong in this context because strong convection is associated with warm air rising, while radiational cooling produces stable, cooler air near the surface. Option D is wrong because sublimation is the direct change of ice to vapour and is not the usual result described here. Memory cue: night cooling to the dew point starts condensation.

Related tags

GeographyRadiational CoolingCondensationDewFogHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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