Erosion is the process by witch the surface of the earth is worn away by the action of water, glaciers, winds and waves.
The three things that cause erosion are water, wind and ice. Erosion forms many different features like mountains, valleys and coastlines. rocks can be eroded into really cool things. erosion can be be eroded by a physical change. erosion normally breaks down in to really small pieces,but sometimes rocks and soil go down hill.