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Natural Resources Defense Council

What the heck is going on here?

The video appears to have first hit YouTube in early November and has been making its rounds on social media. There have been a lot of guesses as to what it is, ranging from a flowing sand dune to a river of quicksand.

The answer? Hail.

When you get enough of it, it can flow like a river, picking up loose dirt or sand along the way. It happened in Colorado a few years ago and in the Texas Panhandle in 2012.

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