Ash flows are rarely dangerous.

Name: Ash flows are rarely dangerous.
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Quizplus · Accepted Answer

Ash flows, also known as pyroclastic flows, are extremely dangerous and deadly volcanic phenomena. They are fast-moving, hot clouds of ash, rock fragments, and gas that can race down the sides of a volcano at speeds of up to 450 mph (700 km/h). These flows can reach temperatures of up to 1,800°F (1,000°C) and can incinerate everything in their path.

Ash Flows Are Rarely Dangerous