When ash began to fall on the Colombian town of Armero, local authorities assured residents that it was safe to stay put, despite geologists' warnings to the contrary. It had been more than 140 years since the last serious eruption of the Nevado del Ruiz, known to residents as "the Sleeping Lion." That night, a lahar—a massive flow of mud and debris—swept down the side of the erupting volcano, destroying Armero. It was the worst natural disaster in Columbian history. How many people were killed? Discuss (http://forum.thefreedictionary.com/postst31001_Nevado-del-Ruiz-Erupts-in-Colombia--1985-.aspx)
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