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Erosion by Glaciers. Like flowing water, flowing ice erodes the land and deposits the material elsewhere. Glaciers cause erosion in two main ways: plucking and abrasion. Plucking is the process by which rocks and other sediments are picked up by a glacier. They freeze to the bottom of the glacier and are carried away by the flowing ice.
Landslides occur when the slope changes from a stable to an unstable condition. 1  A change in the stability of a slope can be caused by a number of factors, acting together or alone. Natural causes of landslides include: 2  groundwater (pore water) pressure acting to destabilize the slope.