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Erfurt ( AIR-furt, AIR-foort; German pronunciation: [ˈɛʁfʊʁt] (listen)) is the capital and largest city in the state of Thuringia, central Germany.
Erfurt lies in the southern part of the Thuringian Basin, within the wide valley of the Gera river. It is located 100 km (62 mi) south-west of Leipzig, 300 km (186 mi) south-west of Berlin, 400 km (249 mi) north of Munich and 250 km (155 mi) north-east of Frankfurt. Together with a string of neighbouring cities Gotha, Weimar, Jena and others, Erfurt forms the central metropolitan corridor of Thuringia called Thüringer Städtekette (German "Thuringian city chain") with over 500,000 inhabitants.
Erfurt's old town is one of the best preserved medieval city centres in Germany. Tourist attractions include the Krämerbrücke (Merchants' bridge), the Old Synagogue, the ensemble of Erfurt Cathedral and Severikirche (St Severus's Church) and Petersberg Citadel, one of the largest and best preserved town fortresses in Europe. The city's economy is based on agriculture, horticulture and microelectronics. Its central location has led to it becoming a logistics hub for Germany and central Europe. Erfurt hosts the second-largest trade fair in eastern Germany (after Leipzig) as well as the public television children's channel KiKa.
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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.