Description
Gobustan, Azerbaijan: mud spewing out from the earth due to compactional stress, Azerbaijan has the most mud volcanoes in the world, with around 300 of them, around a third of all mud volcanoes in the world. The gas that the mud volcanoes emit consists of 90% highly flammable methane. The mud contains iodine, bromine, calcium and magnesium and is rich in minerals. The mud is said to have health-promoting effects on the skin.