| 11. | Lava of the unstable dome may occasionally create minor pyroclastic flows, explosions and eruption columns.
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| 12. | Originally, the dispersal index was considered a function of the height of the eruption column.
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| 13. | An eruption column rose into the atmosphere and deposited ash in 11 U . S . states.
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| 14. | Eruption columns are not usually visible on weather radar and may be obscured by cloud or night.
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| 15. | Large eruption columns formed, causing numerous pyroclastic flows down the heavily populated slopes of the volcano.
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| 16. | The eruption column caused a large pumice-fall deposit to the east of the source area.
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| 17. | The eruption was the strongest of the three lava dome forming eruptions and formed an eruption column high.
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| 18. | The solid or liquid material in an eruption column is lifted by processes which vary as the material ascends:
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| 19. | The Krakatoa ( Indonesia ) eruption of 1883 produced an eruption column which rose to more than 50 km.
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| 20. | Explosive activity with eruption columns of height may result in ashfall in Arica and Putre depending on the season.
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