BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Crater lake. View of the Pulvermaar crater lake. This ancient feature, a maar lake, is the remnants of a long-extinct volcano. Maar craters form when molten magma rises from the Earth and meets surface water or ice, causing massive steam explosions. They are nearly always roughly circular in shape, as here. Photographed near Eifel, Germany.
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