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When does radiation fog generally form?

Answer and explanation

Correct answer: After strong radiational cooling of the surface at night

Answer: C. Radiation fog generally forms after the ground or another surface loses heat by radiation, especially during a clear, calm night. The surface becomes colder, and the air touching it is cooled. If that air reaches its dew point, water vapour condenses into tiny droplets near the ground, producing fog. A is wrong because strong afternoon heating usually warms the surface and does not provide the usual condition for radiation fog; dry air also contains less moisture. B is unrelated because earthquakes do not create the required cooling and condensation process. D is wrong because radiation fog is an atmospheric phenomenon near a cooled land surface, not a feature of the deep sea floor. Memory cue: radiation fog means night-time surface cooling followed by condensation.

Related tags

Radiation FogNight CoolingDew PointCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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