Which of the following is NOT a factor contributing to erosion?

The factor that is not contributing to erosion is vegetation. Vegetation plays a crucial role in preventing erosion rather than promoting it. The roots of plants and trees help to stabilize the soil, holding it in place and reducing the speed at which water can flow over the surface. This stabilization minimizes the impact of both wind and water, which are primary agents of erosion.

In contrast, water flow, wind, and soil disturbance are all significant contributors to erosion. Water can displace soil particles as it moves over the ground, leading to both surface erosion and sediment transport. Wind can lift and carry lighter soil particles, particularly in arid or bare areas, contributing to the erosion process. Soil disturbance, such as that caused by construction or agricultural practices, can expose unprotected soil to the elements, increasing its susceptibility to both wind and water erosion. Thus, while the first three options actively contribute to erosion, vegetation serves as a protective factor in the ecosystem.