Which condition is associated with greater wind erosivity?

Increased wind velocity is associated with greater wind erosivity because stronger winds have a greater capacity to detach soil particles from the surface and transport them. When wind velocity is heightened, the force exerted on the soil particles increases, making it easier for the particles to become airborne. This can lead to significant soil erosion, particularly in regions where vegetation or other protective cover is sparse.

In contrast, low wind velocity does not exert enough force to effectively lift or move soil particles, thus reducing the risk of erosion. High soil moisture typically bonds soil particles together, making it more difficult for wind to displace them, while higher surface roughness can act as a barrier to wind flow, further diminishing wind's erosive power. Understanding these dynamics is crucial when assessing the potential for wind erosion in various environments.