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Because the amount of water vapour changes it is considered what type of atmospheric component?

Answer and explanation

Correct answer: Variable component

Direct answer: D, a variable component. Atmospheric composition contains gases whose proportions remain comparatively stable and components whose amounts change from place to place and time to time. Water vapour belongs to the second group: its quantity depends on evaporation, temperature, condensation, rainfall, vegetation and available water surfaces. Therefore it is called a variable atmospheric component. A is wrong because water vapour is not treated as a permanent, nearly constant component in the atmosphere. B is wrong because ‘inert’ describes chemical reactivity, not whether the amount changes; water vapour is also involved in evaporation and condensation. C is wrong because water vapour is not a metallic substance. D is correct because its concentration varies greatly with conditions. A useful caution is that ‘variable’ does not mean unimportant: water vapour strongly influences humidity, clouds, precipitation and weather. Memory cue: changing amount means variable component.

Related tags

GeographyWater VapourAtmospheric CompositionHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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