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In a valley with cold moist air and weak wind in the morning, which phenomenon is most likely?

Answer and explanation

Correct answer: Fog

Correct answer: A, fog. A valley can collect cold, moist air, especially during the night when the surface loses heat. Weak wind prevents rapid mixing with warmer, drier air. As the air cools to its dew point, it becomes saturated and some water vapour condenses into tiny droplets suspended near the ground. This produces valley or radiation fog in the morning. B, desertification, is a long-term process involving land degradation, not a short morning atmospheric event. C, an earthquake, results from movements within the Earth and is unrelated to ordinary fog conditions. D, a hot dry wind requires hot and dry air, the opposite of the conditions given. Memory cue: cold plus moisture plus weak mixing near the ground favours fog.

Related tags

Valley FogMorningMoist AirStable AtmosphereForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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