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mass movement
the downslope movement of earth materials under the direct influence of gravity
resisting forces
friction (between the slope and loose materials at the surface), cohesion (holds the material together), inertia (the tendency of objects to remain at rest if motionless
slope weakening
weathering, water content (liquefaction), slope gradient, vegetation, and geology
mechanical weathering
disintegration by physical forces breaking rock into smaller pieces
chemical weathering
processes that break down rock components and internal structures of rock minerals; decomposition of minerals in a rock