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Which condition of air masses is decisive in frontal rainfall?

Answer and explanation

Correct answer: Warm and cold air masses meet and lift warm air

The correct answer is B: warm and cold air masses meet, and the warmer, less-dense air is forced upward. The boundary between contrasting air masses is called a front. At this boundary, warm moist air rises over colder, denser air. Rising air expands and cools; water vapour then condenses into clouds and may produce frontal rainfall. A is wrong because separated, dry air masses do not create the necessary uplift or moisture. C describes possible relief rainfall, not the defining cause of frontal rainfall. D is wrong because seawater must evaporate, be transported, condense, and fall; it does not turn directly into rain. Cue: front means meeting air masses and uplift.

Related tags

Frontal RainfallAir MassesWeather FrontsClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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