@CNN: There are more than 400 mud volcanoes in Azerbaijan, more than anywhere else in the world. Pockets of subterranean gas force their way to the surface, belching out methane and a muddy mix of water and oil. https://t.co/gTE7hPRv53 https://t.co/9LaoMMuZ5X

There are more than 400 mud volcanoes in Azerbaijan, more than anywhere else in the world. Pockets of subterranean gas force their way to the surface, belching out methane and a muddy mix of water and oil. https://t.co/gTE7hPRv53 pic.twitter.com/9LaoMMuZ5X

— CNN (@CNN) September 1, 2018