Soil erosion is a problem that causes a loss of soil by nature, but man's land utilization is the catalyst that causes increased. The wash is done, top soil, which has the most nutrients are lost.
Soil erosion is a problem that causes soil erosion by nature. But with the land use of a catalyst that causes the increase. Leaching to keep top soil nutrients, which are very lost.
Soil erosion is a problem that caused the loss of soil by nature. But the land utilization of human is the accelerator that caused more and more. To make the top soil erosion which the nutrient is very lost.