Explain water cycle.
The process in which water evaporates and falls on the land as rain and later flows back into the sea via rivers is known as the water-cycle. All of the water that falls on the land does not immediately flow back into the sea. Some of it seeps into the soil and becomes part of the underground reservoir of fresh-water. Some of this underground water finds its way to the surface through springs. Some we bring it to the surface for our use through wells or tube wells.