What describes slope movement due to forces that cause an overturning moment about a pivot point below the center of gravity?

The term that describes slope movement occurring due to forces creating an overturning moment about a pivot point located below the center of gravity is "Topple." In geotechnical terms, toppling refers to a type of mass movement where a block or segment of the slope rotates forward around a pivot point, often caused by the combined effects of gravitational forces and external stressors.

This movement typically occurs in steep terrain, where the overburden or loose material at the top of a slope is unable to maintain its stability. The pivot point being below the center of gravity emphasizes that the forces causing the toppling are sufficient to rotate the mass forward, leading to a failure mode distinct from sliding or falling.

Other types of slope movements, such as sliding, dropping, or falling, signify different mechanisms of failure that do not necessarily involve an overturning moment about a pivot point situated below the center of gravity, which further clarifies why "Topple" is the accurate answer in this context.