Why does water roll off a hill of sand

Sand dunes serve an important purpose by protecting inland areas from coastal water instrusion.They are able to absorb the impact and protect inland areas from high energy storms and act as a resilient barrier to the destructive forces of wind and waves.

Have a lovely day/night ☺️

False because when you are going on any water activities it is good to know if the water has any recreational illnesses its false on edgenuity also