Lahars are basically debris flows associated with steep volcanic valleys and unconsolidated volcanic deposits.

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Quizplus · Accepted Answer

Lahars are indeed debris flows that occur in volcanic areas with steep valleys and loose volcanic material, such as ash and pumice deposits. These flows can be triggered by heavy rainfall, melting snow and ice, earthquakes, or volcanic eruptions, and can be highly destructive to communities downstream.

Lahars Are Basically Debris Flows Associated with Steep Volcanic Valleys