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Why can fog formation become more likely in valleys at night?

Answer and explanation

Correct answer: Because cold dense air can collect below and become saturated

Direct answer: C. At night, the land surface cools, and the air touching it also becomes colder. Cold air is denser, so it can flow downslope and collect in a valley. If this pooled air contains enough moisture, cooling may bring it to the dew point. Water vapour then condenses into tiny droplets suspended near the ground, producing valley fog. C is correct because it connects cold-air pooling, moisture, saturation, and condensation. A is wrong because valley air is not always hot; nighttime valley air can become cold. B is wrong because fog needs moisture, not its absence. D is wrong because valleys do not double solar radiation, and night-time fog formation is mainly related to cooling. Memory cue: “cold air sinks and moisture gathers”—a valley can become a natural fog bowl.

Related tags

Valley FogCold Air PoolingDew PointNight CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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