Link to the U.S. Geological Survey's home page.
Melting snow and ice on the north flank of Washington's Mount St. Helens, triggered this lahar.
Slide 13.-Melting snow and ice on the north flank of Washington's Mount St. Helens, triggered this lahar (an Indonesian term for a "volcanic debris flow"), which rapidly traveled down the flanks of the mountain with the North Fork of the Toutle River. The melting snow and Ice resulted from the 1982 eruption of Mount St. Helens. Photograph by Tom Casadevall, U.S. Geological Survey.

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