[Pooya/Ali Commentary 23:18] The divine system provides well-measured supply of water to the earth. Normally the rain comes well distributed in fixed seasons. The water comes in drops and flows on the surface of the earth. Only the quantity of water necessary for the earth to grow vegetation is soaked in the soil. It is stored in lakes, wells and rivers. Another form in which water is made available to mankind is the snow glaciers formed in the higher mountain regions which keep many a river flow throughout the year. The unwanted or extra water is carried away by the rivers into the oceans. This ceaseless process provides water for irrigation and to meet other essential demands of human needs.