Answer:
landform
:As water and wind pass across land, they take away grains of soil and wear down rock. Years of this process reduces the size of hills and mountains, and it cuts through ground to create valleys, canyons and ditches.
plants
:When topsoil has eroded, the loss of organic matter can alter the soil's physical properties, especially soil density. Higher clay content at the surface can reduce infiltration of topsoil reducing soil recharge, thus reducing water availability to the plants.
animals
:Grazers expose soil by removing the plant cover for an area. They also churn up the ground with their hooves. If too many animals graze the same land area, the animals' hooves pull plants out by their roots. A land is overgrazed if too many animals are living there.
