BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Volcanic ash mud-flows. View of tortuous mud-flows made of volcanic ash and water on the slope of a volcano. This mud forms rapidly when hot ash from a volcanic eruption falls on snow and ice on the volcano's slopes. This melts the snow and ice, which captures the ash, and forms fast-flowing mud. These features are also known as lahars. On a larger scale they can be catastrophic, engulfing entire towns in minutes and causing a huge loss of life. Photographed on the slopes of the Namafjall Volcano, Iceland.
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