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.
Old Faithful in Yellowstone isn't actually that faithful – it erupts every 60-110 minutes, but earthquakes can change its timing! Iceland has the most geysers in the world because it sits on the Mid-Atlantic Ridge where volcanic activity heats groundwater.
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