10 Things in Nature That Are Not the Color You'd Expect
Blue Lava -- The lava flowing from Indonesia's Kawah Ijen volcano is a typical searing red during the day, but at night it glows a spectacular blue—the result of pure sulfuric acid seeping out from inside. Kawah Ijen contains one of the world's largest acidic crater lakes, a one-kilometer-wide, turquoise-colored body of water. The lake is also a working sulfur mine, with miners often extracting the toxic substance by light of the lava's eerie blue glow.
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