Watch Kilauea volcano send lava 100 feet into the Hawaiian sky. It's one of the world's most active volcanoes. | USA TODAY

The volcano with blue ‘lava’ and a lake of pure acid…😨 With a lake of pure acid and strange blue flames that emanate from beneath the volcano, Kawah Ijen is surely one of the most dangerous places to work in the world. Yet people risk their lives to work at the crater…geologist Dr Glyn Williams-Jones and filmmaker Régis Etienne explain why. #Volcanic | BBC Earth