Topsoil is usually eroded first because it is heavier than other soil is made of small, light particles contains less nutrients than other soil is found below a layer of dead leaves and sticks

Topsoil is usually eroded first because it "is made of small, light particles." The topsoil is a very good layer of the soil that is rich in nutrients. It is where plants can grow. The best quality of soil gives the quality growth of the plants and trees. The topsoil should be soft and made in small and light particles in order for the roots to expand its growth down under.