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Why can fog be common in valleys during morning?

Answer and explanation

Correct answer: Cold dense air collects in valleys

Correct answer: A. During the night, slopes and valley surroundings lose heat. The air near them cools, becomes denser, and flows downward or settles on the valley floor. If this cool air contains enough moisture, it may reach saturation by morning. Condensation then forms tiny suspended droplets, producing valley fog. B is wrong because sunlight does reach valleys, although terrain can delay or limit early heating. C is wrong because moisture is needed for fog and may be supplied by soil, vegetation, water bodies, or moist air. D is wrong because valleys are not necessarily below sea level. Memory cue: cold air sinks and pools in low places.

Related tags

Valley FogCold AirSaturationTopographyForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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