Volcanic ash flows remain close to the ground, but they can travel downhill from the volcano summit very quickly, up to 150 kilometers (90 miles) per hour, incinerating anything in their path as they roar down the slope.

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The Answer of Volcanic ash flows remain close to the ground, but they can travel downhill from the volcano summit very quickly, up to 150 kilometers (90 miles) per hour, incinerating anything in their path as they roar down the slope.

Volcanic Ash Flows Remain Close to the Ground, but They