Labels:book | brass | reckoner OCR: PYROCLASTIC FLOW A hot cloud of rock fragments and gas that moves rapidly away from volcanic vent The base of the flow moves along the ground and rising above towering ash cloud pyroclastic flow can be formed by the collapse eruption column of ash or by the collapse of hot blocks of lava from the summit and flanks growing lava dome Fast -moving pyroclastic flows are one of the most deadly volcanic hazards lastie
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