A hot spring that periodically erupts a column of water and steam into the air. Formed when underground water is heated by volcanic activity and pressure builds until it explodes upward.
From Icelandic 'geysir,' literally meaning 'gusher,' from 'gjósa' (to gush). Named after Geysir, a famous hot spring in Iceland that was one of the first geysers described in scientific literature.
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