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What is the main source of water vapour in the atmosphere?

Answer and explanation

Correct answer: Evaporation from oceans and seas

Correct answer: B, evaporation from oceans and seas. Solar energy heats the surfaces of oceans and seas, causing liquid water molecules to escape into the atmosphere as water vapour. Oceans cover a very large area and contain most of Earth’s total water, so their evaporation supplies the principal amount of atmospheric moisture. A, groundwater, can contribute moisture through springs and evaporation, but it is not the main source. C, volcanoes may release some steam and gases, yet they provide only a minor contribution to the ordinary water cycle. D, plant roots absorb water but do not release it directly into the atmosphere; leaves release it through transpiration. Memory cue: large water surface plus sunlight means major evaporation.

Related tags

EvaporationOceansWater-VapourWater-CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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