reprise from May 2020
MAY 21, geysers: geyser guru
Authors' Note: The geyser (GHIE-zer or GHEE-ser) is an unusual hydrogeologic phenomenon which occurs in volcanic zones where magma (molten lava) is close to the surface, and there is fissuring of rocks due to earthquake faults. Minerals dissolved from adjacent rocks precipitate out, forming a lining for a type of 'plumbing system' in which steam builds up, resulting in regular eruptions of boiling water. Changes in the colour of the swirling hot water in the pool help predict the arrival of the next photogenic discharge.
Yellowstone Park, in the American Rockies, is a site of these natural wonders, including the famous geyser ‘Old Faithful’.
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