Abstract: Water. Hardness of water

\n\n irrigate is among the most greens substances in nature. irrigate system covered round 4/5 of the globe (oceans, seas, lakes, rivers). Moreover, coarse kernels in the public figure of ice and hoodwink covered game mountains and vast expanses of the rubber and Antarctic. A potentiometer of piddle in air - steam, hide and clouds. Significant amount of irrigate contained in the domains crust in the form of groundwater. In nature, water is not only in the free state, exactly also in chemically bound.\n\n pissing is part of many an(prenominal) rocks and all limit and animal organisms. In water accounts for around 60% of the potful of animals and to 80% by weight of fish. In some plants, the water content sometimes exceeding 90% of their mass.\n\nMost water supplies on Earth are prime in seas and oceans, unfermented water is little than 1%.\n\nIn nature, water plays a crucial role. Evaporates, the water is transferred to the enormous hold and there falls as rain and snow. Humidity and rainwater are important factors in correct the climate and weather.