G.S. Chauhan
Since time immemorial, water is most pertinent natural resource not only for biotic and abiotic activities but it is also significant for the human survival. It is a fact that life on the earth began in water which is widely distributed substance on the mother 'Earth. It is unique in nature and is present all parts of the world in different forms. Water plays a key role in various developmental activities i.e. economic, social, biological, chemical, physical and ...