Yes water cycle is very important.It plays a major role in our lifes.As water gets heated up from rivers it goes into the clouds and cools down.After cooling down it precipitates in the form of rain.Some times we get acid rain in some parts of india very rarly,if the water cycle in nature is distured.there are six stages of water cycle.
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Water cycle is important to get fresh water on earth continuously if water cycle will be destroyed like if evaporation will not occur then large part will submerge in water or if precipitation will not occur all water will get evaporated and drought will occur.