| 21. | Volcanic ash fall events can disrupt and or damage the infrastructure upon which society depends.
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| 22. | Caldera forming activity occurred in several eruption phases, accompanied by pumice flows and ash fall.
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| 23. | Some residents were digging out old masks to protect their faces from potentially heavy ash fall.
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| 24. | Eruptions are typically phreatic explosions of small-to-moderate size that produce minor ash falls near the volcano.
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| 25. | Thirty-eight percent of the 1044 were found in the ash fall deposits, the majority inside buildings.
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| 26. | Much of the surface, including the Southern Spur, is covered by deposits left by ash fall.
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| 27. | Ash fall from volcanic eruptions affects the ecosystem.
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| 28. | Heavy volcanic ash falls were observed as far away as Borneo, Sulawesi, Java and Maluku islands.
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| 29. | The argillite probably formed from volcanic ash falls.
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| 30. | No injuries or damage were reported, although ash falls forced an nearby airport to close temporarily.
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