@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

@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