Indonesia’s Ijen volcano emits sulfuric gases that combust into bright blue flames that appear to flow like lava down its side. The lake atop the volcano is filled with sulfuric and hydrochloric acids, making its water roughly as acidic as a car battery.

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Are Volcanoes Dangerous When They’re Not Erupting?

It’s no surprise that an erupting volcano is one that should be avoided at all costs, given the extreme heat of the lava, the rocks pelting through the air, and the suffocating ash. But what about volcanoes that aren’t erupting? Can they also be dangerous? Volcanoes can be dangerous even when