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What is a lahar?

Ash mud flow

geographic land

a type of comet

a type of coffee

A lahar is a violent type of mudflow composed of a slurry of pyroclastic material, rocky debris and water. Lahars are extremely destructive: they can flow tens of metres per second, they have been known to be up to 140 metres deep, and large flows tend to destroy any structures in their path. They have even been known to decimate entire settlements.

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