Assertion: volcano | /r/CapableOf | producing pyroclastic flows
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text: Volcanoes in the Lassen, Shasta and Long Valley areas are capable of producing pyroclastic flows or surges when they do erupt — fast-moving flows of hot ash, rock and gas sweeping down the sides of mountains, of the type that killed 57 people when Mt. St. Helens erupted in 1980.