HEITI PAVES / SCIENCE PHOTO LIBRARY HEITI PAVES / SCIENCE PHOTO LIBRARY
Geyser erupting, Iceland. Footage of a geyser erupting in the valley of Haukadalur, south-western Iceland. A geyser is a deep natural well in a geothermal rock fissure. The water lies in a large chamber at the well's base, and is heated by surrounding rocks until it is well over its normal boiling point. The water is prevented from boiling by hydrostatic pressure, and then, at a critical temperature, the superheated water spontaneously boils, resulting in periodic eruptions as here. Photographed in December.
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