On April 22, 2015, the Calbuco volcano in Chile erupted. German filmmaker Martin Heck was there to witness the spectacle. From his safe perch 20 kilometers away, he shot time-lapse footage of this once-in-a-lifetime natural event.
As if a volcanic eruption wasn't dramatic enough, one of nature's most powerful phenomena can also trigger lightning — to truly breathtaking effect. How does this happen?
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