rain causes erosion & erosion decreases the amount of nutrients in soil ->  rain can decrease the amount of nutrients in soil  rain can decrease the amount of nutrients in soil & decreasing something can cause something to be removed ->  nutrients in soil can be removed by  rain  nutrients in soil can be removed by  rain & removing something is a kind of change & rain is a kind of natural process -> an example of a soil change caused by natural processes is nutrients in soil being removed by rain