I think it would be hanging valley.
Answer:
Active citizenship refers to a philosophy espoused by organizations and educational institutions which advocates that members of charitable organizations, companies or nation-states have certain roles and responsibilities to society and the environment, although those members may not have specific governing roles.
Explanation:
A creep is a slow downward progression of rock and soil on a slope of terrain.
A rockfall is a mass of loose rocks that fall down a slope.
A landslide is a mass of earth and/or rocks that have collapsed from a mountain or cliff.
A mudflow is an avalanche of big amounts mud.