MARK DE FRAEYE / SCIENCE PHOTO LIBRARY MARK DE FRAEYE / SCIENCE PHOTO LIBRARY
Weathered columnar basalt formation. Columnar basalt is formed by rapid cooling of a lava flow. The hexagonal shape of the columnar jointing is due to the prescence of pyroxene. Photographed in the Cantal region of the Auvergne Volcanoes National Park, France.
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