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Why is it said that fog is not guaranteed by high humidity alone?

Answer and explanation

Correct answer: Because saturation, cooling, moisture, and tiny droplet conditions must combine

Correct answer: A. Humidity tells us how much water vapour is present compared with the air’s capacity to hold it, but humidity by itself does not guarantee visible fog. For fog to develop, there must be enough moisture, cooling toward saturation, suitable condensation nuclei, and conditions that allow countless tiny droplets to remain near the ground. The air may be humid but still unsaturated, or it may reach saturation without producing a thick visible layer at the observer’s level. A is correct because it includes the combined conditions. B is wrong: humidity is directly related to water vapour. C is wrong: earthquakes are not a necessary cause of fog. D is wrong: high humidity indicates moist, not necessarily dry, air. Memory cue: high humidity is a possibility signal, not a promise; fog needs moisture plus cooling and suspended droplets.

Related tags

FogHumidityCondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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