In wolk is yn de ierdske atmosfear in op it each gearhingjende samling fan meast swevende wetterdripkes of iiskristaltsjes of in kombinaasje fan beide.
De wetterdripkes en iiskristaltsjes ûntsteane troch kondinsaasje of ferriping fan ûnsichtbere wetterdamp as de relative luchtfochtichheid boppe de 100% komd is.
Der binne fjouwer haadtypen, ek wol wolkefamyljes neamd:
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