Mudflow, Mount Saint Helens, Washington
Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, U.S. Geological Survey. |
Melting snow and ice on the north flank of Mount Saint Helens (after an eruption in 1982), triggered this lahar which traveled rapidly down the valley of the North Fork of the Toutle River. Image Credit: U.S. Geological Survey The slopes above streams and rivers are subjected to a variety of processes that cause them to recede and retreat from the river or stream channel. These processes, collectively called mass wasting, can be classified according to rapidity of movement and according to the type of materials that are transported. |
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