Erosion

Definition of Erosion

To wear away by the action of water, wind, or other elements. The gradual eating away of the soil by the operation of currents or tides. distinguished from submergence, which is the disappearance of the soil under the water and the formation of a navigable body over it.

That's the definition of Erosion in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.