Salt (History, Importance and Salt Economy of World)

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  • Salt (History, Importance and Salt Economy of World)
Salt is a remarkable mineral. Salt has a long and influential role in world history. From the dawn of civilization, salt has been a key factor in economic, religious, social and political development. In every part of the world, salt has been the subject of superstition and folklore, battles have been fought over it and it has even been used as currency. Salt is a basic ingredient in industrial processes, from the formulation of chemicals to the production of paper and the manufacture and coating of glass, steel and plastic. There are an estimated 14.000 commercial uses for salt. Many stem form the fact that salt provides the ionized form of two essential elements: Sodium and Chlorine. Sodium and chlorine, are basic components of an array of materials, such as plastics, glass, synthetic rubber, cleansers, pesticides, paints, adhesives, metal coatings and chlor-alkali chemicals. Used as a deicer, salt lowers the freezing temperature of water, which means it has to be much colder to form ice. Salt prevents snow from bonding to the road surface when cars and trucks pack it down. The oceans contain the largest amount about 3 percent of the weight of seawaters sodium chloride. In some inland areas, the ratio may be even higher as much as 15 percent of the weight. They include the Dead Sea (in border of Jordan-Israel), the Tuz gölü (in Turkey), the Great Salt Lake (in United States), and other deposits in various parts of the United States, Great Britain, Germany, France, Austria and India. Natural deposits of crystalline sodium chloride known as rock salt or halite also serve as significant sources of salt. These deposits are the products of the evaporation of seas in the distant past. They may occur as beds that lie on or near the Earth's surface or as deposits deep underground. Rock-salt deposits occur in the Punjap region in Pakistan, *