The camel is heavier than man, yet a camel walks easily on sand in desert while it is difficult for a man to walk on the sand.

Explanation

The camel.s feet has large area. The weight of camel, i.e., force applied on large area of the sand exerting less pressure. So camel.s feet do not sink into the sand. But due to small area of man.s feet, the force of his weight falls on the smaller area of the sand exerting more pressure on the sand. Hence, it becomes difficult for man to walk on the sand.