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The Blue Lava of Kawah Ijen Volcano. The ‘blue lavas’ are a rare phenomenon, only visible on the Kawah Ijen Volcano, in Indonesia. It may look like the volcano is spewing blue lava, but in fact, the shocking blue fire occurs when the volcanic sulphuric gases combust. Emerging from cracks in the volcano’s side, these gases ignite when coming into contact with air. It’s not actual blue lava, but blue flames. (video)

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