Water which is so essential in so many ways derives its major source from rains. Water is added to the atmosphere in the form of water vapour by various processes. The water vapour so added to the atmosphere, being lighter than air, reaches the upper atmosphere. There, due to lower temperature it gets condensed to form tiny water droplets which remain suspended in air. These small water droplets associated with the dust particles form larger aggregates called micelles. They appear as clouds and when the quantity of water in the clouds increase, it causes rain. This rain water can form various types of water bodies in the form of surface water and can help recharge ground water level. This natural process of adding water to atmospheric air and its subsequent condensation to rain water is called water cycle. Thus, water cycle builds a natural balance in the ecosystem.
