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- Dictionaryla·har/ˈlähär/
noun
- 1. a destructive mudflow on the slopes of a volcano.
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noun
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A lahar ( from) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water. The material flows down from a volcano, typically along a river valley. Lahars are often extremely destructive and deadly; they can flow tens of metres per second, they have been known to be up to 140 metres (460 ft) deep, and large flows tend to destroy any structures ... Wikipedia