Water Erosion

In science class we are learning about different erosions and we were assigned in 2-3 people in a group about a wind, water, glacier and my group did water, and what we did is made a model out of play dough of a before and after structure. The before has like mountains with powdered sugar, and theres rivers, and in the after one the mountains have less snow cause the snow has slid down and over millions of years creating more rivers, valleys, etc.