Hydrological cycle

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Terms & Synonyms

Official WHO Definition

Movement and circulation of water in the atmosphere, on land surfaces, and through the soils and subsurface of rocks (WHO et al. 2003).

Other Definitions


Interpretations and Explanations

About 97% of the world’s water is in the oceans and about 75% of its fresh water takes the form of glaciers and polar ice. Water vapour in the atmosphere condenses and appears as dew or precipitation. Liquid water, ice and snow evaporate (WHO et al. 2003).


WHO, WMO and UNEP (2003) Climate change and human health: Risks and responses

WHO Lexicon page (translations and examples)

See also

External Resources


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