Final answer:
Lahars are fast-moving volcanic mudflows that can travel long distances with devastating effects.
Explanation:
Lahars are Indonesian mudflows composed of water, ash, and debris that move down volcanoes, reaching speeds up to 50 mph. They can travel long distances in river valleys resembling flash floods. An example of a lahar was the catastrophic event that occurred in Armero, Colombia, in 1985.
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