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678 yards per minute is about one-nine-thousandth as fast as a bolt of Lightning
In other words, it's 0.00011 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 9,100 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 6,400,000 yards per minute when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
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