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In which condition is the role of atmospheric water vapour in rainfall formation most clearly seen?

Answer and explanation

Correct answer: When moist air cools to saturation and condensation occurs

Direct answer: B is correct. Rainfall needs atmospheric moisture and a process that cools moist air. When moist air rises or is cooled in another way, its temperature may reach the dew point. The air then becomes saturated, meaning it cannot retain all its water vapour in gaseous form at that temperature. Excess vapour condenses on tiny particles into cloud droplets or ice crystals. These particles may join, grow and eventually fall as precipitation. A is wrong because dry air lacks the moisture needed for rain. C is unrelated to ordinary rainfall formation. D is impossible in the stated context and gravity is important for droplets falling to Earth. Thus B correctly describes saturation followed by condensation. Memory cue: “Moisture plus cooling leads to clouds and possible rain.”

Related tags

Water VapourRainfallCondensationSaturationGeographyClass 11Lettering And NumberingIntroduction To Engineering Drawing

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