Strokkur geyser in Iceland

Strokkur geyser in Iceland

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Credit: SIMON FRASER/SCIENCE PHOTO LIBRARY

Caption: View of the Strokkur geyser at Geysir in Iceland as it starts to erupt. Every few minutes this hot spring throws a plume of steam & superheated water 20-40 metres into the air. A geyser consists of a deep central tube fed by ramifying branches. Juvenile water (emanating from cooling magma) accumulates in this system and, owing to the pressure-head of the water column, superheating of the liquid occurs. When the critical temperature is exceeded, the liquid passes into the gaseous (steam) phase, whereupon the whole mass boils vigorously and fountains into the air. Strokkur ("The Churn") is close to the eponymous Geysir ("The Gusher") geyser which is no longer active.

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Keywords: hot, hot spring, hot springs, iceland, springs, strokkur geyser, thermal springs

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