Q. What is the water cycle?
The water cycle represents the recycling and circulation of water in nature. The Liquid water on the planet surface is heated by the sun and turns into water vapor that gains the atmosphere. In the atmosphere huge volumes of water vapor form clouds that when cooled precipitate liquid water as rain. Thus water comes back to the planet surface and the cycle is completed. As probable steps of the cycle, water may still be stored in subterranean reserves or in the form of ice in mountains and oceans and it may also be used in the metabolism of living beings, incorporated into the body of the individuals or excreted through urine, transpiration and feces.