What is water erosion???

Water erosion is the wearing away of the soil surface by water from rain, runoff, snowmelt, and irrigation. ... Water erosion occurs in all soils to varying degrees. Slight erosion is actually beneficial to the formation of soil but severe or accelerated erosion adversely affects soil and environment.

Source: SpringerLink

hope this helps!

answer; /// i believe that one of the causes is (a loss of habitat);

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )