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Cumberland Falls in Kentucky is famous for being one of the few Western Hemisphere sites to regularly produce what?

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Correct answer: A moonbow

Cumberland Falls, often called the 'Niagara of the South,' is famous for its regular 'moonbows' (lunar rainbows). This rare phenomenon occurs during a full moon, when light reflects off the mist of the waterfall, creating a ghostly white arc of light across the night sky. Photo: Aaron Vowels, Wikimedia Commons, CC BY 2.0.

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Source: Wikipedia (CC BY-SA)

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