Landslides, Set 1 |  | 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. This set of slides depicts diverse types of landslides and mass wasting. Photos were taken in the U.S., Canada, Australia, Peru, and Switzerland. It includes the famous 1903 rock slide at Frank, Alberta, Canada, and the 1970 earthquake-induced rock and snow slide at Yungay and Ramrahirca in Peru.
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Landslides, Set 2 |  | This set expands the topics included in Set 1 and includes (in addition to landslides) rockfalls, rock avalanches, mud flows, debris flows, slumps, creep, and sinkholes. The photos were taken in California, Colorado, Idaho, Nevada, Utah, Washington state, and the countries of Peru and Puerto Rico. Eighteen of the slides depict events that occurred between 1980 and 1999.
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