| 31. | The initial phases of eruption are characterized by pyroclastic flows.
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| 32. | Pel�an eruptions are characterized most prominently by the incandescent pyroclastic flows that they drive.
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| 33. | The Pucarilla-Cerro Tipillas volcanic complex is formed by pyroclastic flows.
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| 34. | Today these volcanic products are seen as pyroclastic flow uplands and low relief hills.
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| 35. | The first pyroclastic flow was observed around 10 : 12.
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| 36. | Nineteen people died when pyroclastic flows cascaded down the mountain on June 25, 1997.
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| 37. | The solidifying lava would occasionally collapse portions of the volcano to create pyroclastic flows.
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| 38. | Known as pyroclastic flows, the material forms rivers that obliterate everything in their path.
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| 39. | Later volcanic activity buried this edifice beneath thin pyroclastic flows.
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| 40. | Pyroclastic flows of hot pumice and ash along with dome growth occurred during this period.
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