A lahar is produced when
A)ash is blown out of a vent and onto the side of the volcano
B)ash and other pyroclastic ejecta become saturated with water
C)a lateral blast spreads ash across a large area
D)a lava flow breaks apart on the steep portion of a composite cone

Question

Quizplus · Accepted Answer

A lahar is a highly destructive volcanic mudflow that occurs when ash and other pyroclastic ejecta on the slope of a volcano become saturated with water, typically from heavy rainfall or melting snow and ice. The water content reduces the friction between the particles and destabilizes the slope, causing the mixture to slide down the volcano's flank at high speeds, sometimes reaching up to 100 km/h (60 mph). Lahars can be highly destructive, burying entire towns and causing widespread damage to infrastructure.

A Lahar Is Produced When