landslide

thumb|right|A landslide near Cusco, Peru, in 2018 thumb|A NASA model has been developed to look at how potential landslide activity is changing around the world. thumb|Animation of a landslide in San Mateo County, California in the United States thumb|Landslips thumb|Noire River (Sainte-Anne River tributary)|Noire River (Rivière Noire), Saint-Alban landslide 1894, [[Quebec, Canada]] Landslides, also known as landslips, rockslips or rockslides, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, mudflows, shallow or deep-seated slope failures and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides.

Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable.