Dr. Anil Kumar Saini
Water is essential part of nature because in nature all types of mechanism are proceeds by the use of water. It is a chemical substance which is made of by the chemical reaction of hydrogen and oxygen. It’s molecular formula is H2O with tetrahedral geometry. It is found in mainly three different physical state i.e. solid, liquid and gaseous state. Solid state is found as ice, liquid state is present as water and gaseous state is found in vapour form. These physical form of water are distributed in surroundings as oceans water, ground water and surface water. Oceans water is non-drinkable due to the presence of high concentration of salts containing Ca+2, Mg+2, Na+, K+ etc. There are many sources of water on earth like oceans, springs, well, gysers, artesian well, lakes, rivers, rain, snow fields, glaciers etc.. It is very necessary to know about the distribution and sources of water on earth so that we can usefully utilize and manage the very important part of nature i.e. water.
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