MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Geothermal formation. This structure has been formed by deposits of silica from hot water issuing from a shaft. The dissolved silica precipitates out as the water cools. Geothermal areas are where volcanic activity drives hot water and steam to the surface. Photographed in Iceland.
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