Water is one of the most important environmental substances on earth. Water on Earth moves continually through the water cycle of evaporation and transpiration , condensation, precipitation.The water endlessly is renewable. Water that is safe for drinking is called potable water.Water that is not safe to drink is said to be non-potable. Water that looks drinkable can contain harmful elements, which could cause illness and death if ingested.Every day, we lose 2-3 quarts of water through urination, sweating and breathing. Water is the driving force of all nature.
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