Israeli and U.S. researchers have solved the mystery of the sinking salt crystals in the Dead Sea, the Geological Survey of Israel (GSI) published on Wednesday. The process leading to the slow falling and the expansion of salt layers at the bottom of the Israeli-Jordanian lake intrigued scientists, because this apparently contradicts the principles of physics. The study, conducted by researchers from the University of California, Santa Barbara, the GSI and Bar-Ilan University in central Israel, explains the unusual phenomenon.

The Dead Sea is located at the lowest point in the world, more than 433 meters below sea level. /VCG Photo The Dead Sea is located at the lowest point in the world, more than 433 meters below sea level. /VCG Photo

The research findings, published in the journal Water Resources Research, may help to understand how large salt deposits evolved on Earth. The Dead Sea lake is located at the lowest point in the world which is more than 433 meters below sea level in southeast Israel and has no life in its water, be it fish, insects or plants, because of its high salt concentration, around 34 percent. In 1979, was discovered that saline crystals emerged from the upper layer of the water, slowly sinking into a process that scientists linked to "snowing" and piling up at the bottom.

The Dead Sea has no fish, plants or insects because of its staggering salt concentration. /VCG Photo The Dead Sea has no fish, plants or insects because of its staggering salt concentration. /VCG Photo

It was found in the Israeli-U.S. research that small spores in the lake, caused by waves or other motions, create "salt fingers" that lead the salt to the bottom in a kind of funnel. According to the researchers, at first, only a few millimeters thick of salt fingers are created, forming a huge amount of salt stream. Next, they quickly connect with each other as they fall, creating larger structures. During the summer, the sun warms the Dead Sea surface and divides it into two layers, a warm top layer and a colder one. When the water evaporates from the top layer, it becomes saltier than the lower one. The scientists realized that the salt sinking comes from the upper layer, but this hot water does not mix with the colder water below because of the temperature and the density differences.

During the summer, the sun warms the Dead Sea surface and divides it into two layers. /VCG Photo During the summer, the sun warms the Dead Sea surface and divides it into two layers. /VCG Photo

Assisted by a computer simulation, the researchers found that when the upper layer "shakes" because of waves or other motions, some hot water enter the colder layer below. Heat dissipates faster than salt, so the water quickly cools. As they cool down, the water becomes less saline, so salt deposits break down and form crystals that sink to the bottom. (Cover image via VCG) (If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)

Source(s): Xinhua News Agency