Girls' feet scratching will make the sound of rubbing sand. When fingers or other objects rub the skin of the soles of the feet, there will be a rubbing sound. This sound is caused by fine particles on the skin surface or friction between the skin and fingers. When the sole skin is dry or rough, there will be obvious sand noise when rubbing, so girls' feet will make sand noise. Feet are a part of the human body and a structure connecting the body with the ground. It is located at the end of human lower limbs and consists of feet and ankles.