El azufre en combustión desprende espectaculares llamas azules en el volcán Kawah Ijen, en la isla indonesia de Java, que solo son visibles de noche. | Revista National Geographic en español

The Blue Flames Aren’t Lava—They’re Burning Sulfur At Kawah Ijen in Indonesia, rivers of glowing electric blue light flow down the volcano at night. Despite appearances, this isn’t molten rock—it’s liquid sulfur burning at about 1,110°F (600°C) as it ignites on contact with air. The rare phenomenon occurs where sulfur-rich gases escape and condense into liquid before igniting. Important Details: • Known as “blue lava” phenomenon • Actually burning liquid sulfur • Temperature around 1,110°F • Vis

The world’s only volcano that produces luminous blue fire is Kawah Ijen in Indonesia. The glowing flames are not lava—they’re caused by burning sulfuric gases igniting upon contact with oxygen at extremely high temperatures. The phenomenon is visible only at night. Important Details: • Only volcano with visible blue flames • Caused by ignited sulfur gases • Not molten lava • Visible only after dark • Result of extreme geothermal heat #EarthMysteries #VolcanoFacts #BlueFire #Geology #NaturalWonde

The only place on Earth where you can witness luminous blue fire inside a volcano is Kawah Ijen, located in Indonesia. The eerie blue glow is not lava—it’s caused by ignited sulfuric gases that emerge at extremely high temperatures and burn with an electric-blue flame when they contact oxygen. The phenomenon is visible only at night and has made Ijen one of the most unusual geological sites on the planet. Key Facts: • Only volcano with visible blue flames • Caused by burning sulfuric gases, not