Why are colorful salt lakes colorful?

Because the colorful salt lake is rich in salt, the contents of heavy metals such as lead, mercury and cadmium in the lake are lower than those in the Dead Sea, while the contents of elements such as sodium, calcium and magnesium are higher than those in the Dead Sea. The density of lake water reaches 0/.25g-1.29g per cubic centimeter (higher than that of human body), and the buoyancy generated is 30% higher than that of fresh water.

Lake water with high magnesium sulfate content will appear red; Lake water with high sodium sulfate content will be yellow; The lake rich in green algae will look green.

The color change of Yuncheng Salt Lake depends on many reasons. The concentration, composition and temperature of brine cultured in salt ponds are different, and the reproduction speed and quantity of specific organisms such as algae and Artemia in salt ponds are different in different seasons, so the color will be different.

Yuncheng Salt Lake is located in Yuncheng City, southwest of Shanxi Province, China, at the northern foot of Zhongtiao Mountain. It is the largest lake in Shanxi Province and the third largest inland lake of sodium sulfate type in the world, which was formed in Cenozoic Quaternary.

Yuncheng Salt Lake consists of Jiechi, Xiaotang, Yatang, Tanglitan, Beimen Beach and Wuxing Lake, with a total area of 154 square kilometers. Among them, the solution pool is the largest, and Yuncheng Salt Lake in a narrow sense refers to the solution pool.

Xiechi is located in the southeast of Salt Lake District of Yuncheng City, with an altitude of 32 1 m, a length of 20.8 km, an average width of 1.44 km and an area of 97 square kilometers.

Nitrate pool is located in the southwest of inclined pool, covering an area of 20 square kilometers; Yatang is located in the northeast of Xiechi, covering an area of 6 square kilometers; Wuhu Lake is located in the west and east of yongji city, covering an area of 20 square kilometers.

The lake area lacks natural river supply, and the Sushui River flows westward into Wuxing Lake and then into the Yellow River. The annual average temperature in the lake area is 13.6℃, the annual average precipitation is 559.3mm, and the annual evaporation is 2550mm. Yuncheng Salt Lake is rich in halite and mirabilite. After a long period of precipitation and evaporation, a natural saltwater lake has been formed.

Salt Lake has a history of more than 4,000 years of salt mining, and the salt produced is called "Xie Yan", "Luyan" or "Hedong Salt". Salt tax was once an important source of national fiscal revenue. Salt Lake is still an important chemical raw material base in China. There are many historical sites around the Salt Lake, which is now a tourist attraction and is called the "Sea of Death".