Here's why:

* Creep is a very slow form of soil movement, often imperceptible to the naked eye. It happens downhill, caused by the gradual shifting of soil particles due to gravity.

* Erosion is the process of wearing away and transporting soil and rock by natural forces like wind, water, or ice.

While deposition can sometimes play a role in creep, it's not the primary cause. Deposition (the dropping of sediment) might contribute to the buildup of material that can then creep downhill. However, the actual movement of the soil is driven by erosion.

Think of it this way:

* Erosion is like the force that picks up the soil.

* Creep is the slow, downward movement of that soil.

Let me know if you have any more questions!