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A lahar is a destructive mudflow that travels down the slopes of a volcano when water, often from a heavy rainfall, lake breakout, or water body or glacier displaced or melted by an eruption, mixes with rocky debris and volcanic ash. Lahars can travel up to 60 mph (100 km/h) and are similar to concrete in consistency. In 1985, lahars created by the eruption of Colombia’s Nevado del Ruiz buried 22,000 people in 26 ft (8 m) of mud. What places are considered to be particularly at risk for lahars? Discuss
Source: The Free Dictionary