Final answer:
Soil creep is a geological process that results in the rough sorting of particles, with larger pieces found farther downslope. The gradual movement of soil and rock material is primarily driven by gravity and facilitated by environmental factors such as water action, freeze-thaw cycles, and erosion.
Step-by-step explanation:
In instances where there is a rough sorting of particles, with larger pieces farther downslope, the process involved is generally known as soil creep. Soil creep is a slow and gradual movement of soil and rock down a slope. It is characterized by the downhill flow of soil and rock material following gravity, causing larger particles and debris to move to lower elevations while finer materials tend to accumulate in the upper part of the slope.
This phenomenon is driven by factors such as freeze-thaw cycles, the wetting and drying of material, and the presence of water, which can act as a lubricant facilitating the movement of particles. Erosion can also play a significant role in the process, further affecting how the material is sorted along the slope.