posted by Anonymous .
After a sled passed over a snowy path on a hill, the grass or dirt under the snow may begin to show through where the sled has traveled, why?
Friction of the sled causes an increase in temperature which causes melting. Right? It also may compress the snow due to the weight of the sled. Pressure alone on snow may cause melting.
because it has went down several times that the ground shows the marks because like i said it went down several times.