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Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in its natural form as a crystalline mineral is known as rock salt or halite. Salt is present in vast quantities in seawater, where it is the main mineral constituent. The open ocean has about 35 grams (1.2 oz) of solids per liter of sea water, a salinity of 3.5%.
Salt is essential for life in general, and saltiness is one of the basic human tastes. Salt is one of the oldest and most ubiquitous food seasonings, and salting is an important method of food preservation.
Some of the earliest evidence of salt processing dates to around 6,000 BC, when people living in the area of present-day Romania boiled spring water to extract salts; a salt-works in China dates to approximately the same period. Salt was also prized by the ancient Hebrews, the Greeks, the Romans, the Byzantines, the Hittites, Egyptians, and the Indians. Salt became an important article of trade and was transported by boat across the Mediterranean Sea, along specially built salt roads, and across the Sahara on camel caravans. The scarcity and universal need for salt have led nations to go to war over it and use it to raise tax revenues. Salt is used in religious ceremonies and has other cultural and traditional significance.
Nizhny Novgorod | |
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Nizhny Novgorod (Russian: Нижний Новгород, IPA: [ˈnʲiʐnʲɪj ˈnovɡərət]), colloquially shortened to Nizhny, formerly known as Gorky (Горький) (1932–1990), is the administrative centre of Nizhny Novgorod Oblast and the Volga Federal District. The city is located at the confluence of the Oka and the Volga rivers in Central Russia, with a population of over 1.2 million residents, up to roughly 2.1 million residents in the urban agglomeration. Nizhny Novgorod is the sixth-largest city in Russia, the second-most populous city on the Volga, as well as the Volga Federal District. It is an important economic, transportation, scientific, educational and cultural center in Russia and the vast Volga-Vyatka economic region, and is the main center of river tourism in Russia. In the historic part of the city there are many universities, theaters, museums and churches.
The city was founded on 4 February 1221 by Prince Yuri II of Vladimir. In 1612 Kuzma Minin and Prince Dmitry Pozharsky organized an army for the liberation of Moscow from the Poles. In 1817 Nizhny Novgorod became a great trade center of the Russian Empire. In 1896 at a fair, an All-Russia Exhibition was organized. During the Soviet period, the city turned into an important industrial center. In particular, the Gorky Automobile Plant was constructed in this period.