Mount Rainier rises above the town of Orting, Washington. Around Orting are signs warning about the danger of a "Lahar" and giving directions to the evacuation route. A "Lahar" is a fast moving mud flow from a mountain or a volcano. A Lahar may be caused by an earthquake or an eruption. 500 years ago, a mud flow from Mount Rainier devastated the entire area reaching all the way to what is now Tacoma.
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