King Indra of the heavenly planets is in charge of throwing thunderbolts and giving rainfall. Generally thunderbolts are thrown on the tops of hills in order to break them to pieces. As these pieces are spread asunder in due course of time, the surface of the globe gradually becomes fit for agriculture. Level land is especially conducive to the production of grain. Thus the planet earth requested Maharaja Prthu to level the surface of the earth, breaking up the high land and mountains.