In the Andes Mountains of South America, entire towns of thousands of people have been buried suddenly when water and loose materials traveled downhill as a viscous fluid. This type of catastrophic event is known as a

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A debris avalanche is a fast-moving mass of loose mud, sand, soil, rock, and water that travels down a slope, often triggered by heavy rain or volcanic activity, and can bury entire towns.

In the Andes Mountains of South America, Entire Towns of Thousands