The Kawah Ijen volcano in Java, Indonesia is a spectacular (and dangerous) sight to behold. Unlike any other volcano in the world, Kawah Ijen emits what appear to be bright blue flames. The glow is caused not by lava, but instead by sulfuric gases that create electric blue sparks when in contact with oxygen. Once the gases cool, bright yellow sulfur is formed, which is then mined and sold.
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