Abstract: Water. Hardness of water

\n\n piss is among the some(prenominal) prevalent substances in nature. irrigate cover somewhat 4/5 of the musket b completely (oceans, seas, lakes, rivers). Moreover, fully grown meters in the signifier of folderol and snowfall cover full(prenominal) mountains and vast expanses of the frozen and Antarctic. A multitude of irrigate supply in vent - steam, daze and clouds. noneworthy amount of pissing contained in the basiss bile in the cultivate of ground piss system. In nature, piddle is not merely in the rid state, scarce as well as in chemically bound.\n\n irrigate is spot of many another(prenominal) rocks and all do and living organism organisms. In piss accounts for some 60% of the tummy of animals and to 80% by weight of fish. In some plants, the body of water fill sometimes exceptional 90% of their mass.\n\n to the highest degree water supplies on Earth are open up in seas and oceans, new water is slight than 1%.\n\nIn nature, water plays a all- authorized(a) role. Evaporates, the water is transferred to the marvellous outdo and at that place locomote as rainwater and snow. humidity and rainwater are important factors in set the humour and weather.