Geysers erupt when superheated groundwater flashes into steam
A geyser needs heat, water, and a constricted plumbing system: groundwater can sit hotter than surface boiling point under pressure until a trigger lets some flash to steam and blast the rest skyward.
Intervals depend on how fast the underground reservoir recharges. Famous fields in Iceland, Yellowstone, and New Zealand share that recipe with local twists of rock and chemistry.
Boiling water can become a clockwork fountain. Geysers turn geothermal pressure into one of Earth’s rarest repeating shows.
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