Accelerated wind erosion on an otherwise stable soil increases as the surface crust (i.e., either physical, chemical, or biological crust) is worn by disturbance or abrasion. Areas of wind erosion within a vegetation community are represented by wind-scoured or blowout areas where the finer particles of the topsoil have blown away, sometimes leaving residual gravel, rock, or exposed roots on the soil surface. Deposition of suspended soil particles is often associated with vegetation that provides roughness to slow the wind velocity and allow soil particles to settle from the wind stream.