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San Luis Obispo | |
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Population | 47339 |
San Luis Obispo (; SLO ( for short) is a city in the U.S. state of California, located in San Luis Obispo County, approximately 190 miles (310 km) north of Los Angeles and 230 miles (370 km) south of San Francisco. Located in Southern California's Central Coast region, the population of the city was 45,119 at the 2010 census. The population of the county was 269,637 in 2010.
Founded in 1772 by Spanish Franciscan Junípero Serra, San Luis Obispo is one of California's oldest European-founded communities.
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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.