Do you Know? Why Lord Ganesha is immersed in water?
As Ganesh Charturthi falls at the end of the monsoon season, villagers would gather bits of clay that had washed up around their rivers. They would worship this clay in their homes (as a celebration of the fertility of the Earth), and then return the clay to the river. As the practice evolved, the clay was molded into shapes of idols and, of course, Lord Ganesha.