Answer:
D. Soil erosion
Step-by-step explanation:
Soil erosion may be defined as the displacement of the upper surface layer of soil. In other words, soil erosion may refer to the wearing away of the earth's topsoil by some natural physical forces. This natural forces are rains, wind, ice, etc.
It is a form of soil degradation.
Thus, when the top surface of the soil is washed away by heavy rainfall and floods, it is called soil erosion.