BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
River at volcano base. View of a small river winding through mountains of ash at the base of the Krafla volcano, Iceland. It has eroded a steep valley in the soft ash, with distinctive interlocking spurs. The water in the river is largely made up of melted snow from the warmer regions nearer the crater. Ash is one of the main materials ejected by volcanoes, and can travel great distances from the crater itself.
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