Final answer:
Creep is the mass wasting process with the slowest rate of movement, as it represents a gradual and slow downslope movement of soil or rock.
Step-by-step explanation:
Among mass wasting processes, creep has the slowest rate of movement. Mass wasting includes a wide range of ground movements, such as rock falls, deep failure of slopes, and shallow debris flows.
The slow, gradual, and almost imperceptible movement of soil or rock down a low angle slope is known as creep. This contrasts with more rapid and visible movements such as landslides or rockfalls. Creep can be influenced by factors like soil hydration, freeze-thaw cycles, and soil compaction over time.