Landslides take many different forms and sizes. This photo set progresses through the following: slides, falls and flows. Each of these types of landslides may involve rock, debris (mixed rock and soil) or earth (fine-grained material). Flows of very wet earth are called mudflows, and mudflows associated with volcanoes are called lahars. At the end are photos showing various efforts to control landslides. To learn more, see Landslides in a Nutshell.