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If fog forms only over a river but not over nearby dry land, what is the most appropriate reason?

Answer and explanation

Correct answer: Air over the river has more moisture and sufficient cooling

Answer: A. Fog forms when air near the ground contains enough moisture and cools to its dew point, allowing water vapour to condense into tiny suspended droplets. A river or other water body can supply extra moisture through evaporation. If the air over the river cools sufficiently, its moisture may condense there and form fog. Nearby dry land may have less available moisture or different heating and cooling conditions, so fog may not form there at the same time. Option A correctly combines the moisture source and the necessary cooling. Option B is the opposite of the likely situation. Option C is an absolute statement and is false; dry land does not always produce fog. Option D is also false because a river can support fog formation. Memory cue: fog needs both moisture and cooling, not merely a low temperature.

Related tags

River FogMoisture SourceCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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