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What causes waterfalls to form?

Waterfalls form through various geological processes, but they all involve water flowing over a sudden drop in elevation.
This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. LAS VEGAS (KLAS) — Remnants of a hurricane ...
LAS VEGAS (KLAS) — Remnants of a hurricane caused waterfalls to form in the nation’s hottest and driest national park over the weekend. The National Park Service shared a stunning video of the ...