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Why can moist air from the sea form fog while passing over cold land?

Answer and explanation

Correct answer: Cold land can cool the air to saturation

Correct answer: A. Air moving from the sea often contains substantial moisture. When this moist air passes over a colder land surface, it loses heat to the surface. If it cools to its dew point, the air becomes saturated and some water vapour condenses into tiny droplets suspended near the ground. This type of movement-related fog is commonly described as advection fog. Option A is correct because cooling to saturation explains the complete process. Option B is wrong because cold land cools the air; it does not always destroy its water vapour. Option C is wrong because sea air commonly gains moisture through evaporation from the water surface. Option D is wrong because cooling to saturation does not mean that all moisture disappears; some vapour changes into droplets. The droplets scatter light and reduce visibility. Memory cue: moist air plus a colder surface plus cooling to the dew point can produce fog.

Related tags

Advection FogMoist AirCold LandDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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