Researchers reveal Mystery of Underwater Rings in Baltic Sea

Researchers reveal Mystery of Underwater Rings in Baltic Sea

Danish biologists have finally revealed the mystery behind the origin of unusual dark circles that appeared in the shallow waters of the Baltic Sea. The circles were first observed and captured in photographs by tourists in 2008. Since then, these circles have emerged out to be a subject of discussion in the geosciences world.

The people who saw the images drew many conclusions behind the origin of these circles. Some said they were left by the alien spaceships while other claimed them to be the leftovers from World War II bomb craters.

The teams of researchers from the University of Southern Denmark and the University of Copenhagen have finally discovered that a marine plant, known as 'eelgrass', is the reason behind the origin of these dark circles.

The study suggests that the shape of these rings depends on the growth and death of eelgrass in a particular area. The stronger grass is found outside of the circle, whereas the weaker grass is located in the center of the circle.

The water samples surrounding eelgrass was also analyzed by researchers and found that the mud comprised of high levels of sulfide, which is considered as a poisonous substance to the eelgrass. Sulfide is either formed naturally in a chalky seabed or by the entry of foreign pollutants or chemicals in an ecosystem.

The eelgrass traps the mud and the presence of sulfide in the mud is responsible for killing the eelgrass. When the eelgrass starts dying, the middle area becomes empty first and leaves a hollow circle. Finally, the trapped mud forms the black color of the hollow circle.

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