Landslide. The term landslide refers to several forms of mass wasting that include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflowsand 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 affect