These movements transfer the mass of rock debris down the slopes under the direct influence of gravity. That means, air, water or ice does not carry debris with them from place to place but on the other hand the debris may carry with it air, water or ice. The movements of mass may range from slow to rapid, affecting shallow to deep columns of materials and include creep, flow, slide and fall.

Creep can occur on moderately steep and soil covered slopes. Movement of materials is extremely slow and imperceptible except through extended observation. Material involved can be soil or rock debris.

Source: NCERT