| 11. | Clark was abandoned by American troops during the June 1991 eruption of nearby Mount Pinatubo.
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| 12. | The Philippines'21 active volcanoes include Mount Pinatubo on the main island of Luzon.
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| 13. | Washburn said he spent Tuesday night on Mount Pinatubo after his group encountered the guerrillas.
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| 14. | Near Mount Pinatubo, the United States maintained two large military bases in the region.
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| 15. | The bigger VEI-6 eruptions are comparable to Mount Pinatubo's 1991 eruption.
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| 16. | Wing reservists pitched into to assist survivors of Mount Pinatubo eruption in Operation Fiery Vigil.
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| 17. | The base was abandoned by the Americans at the height of the eruption of Mount Pinatubo.
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| 18. | With the 1991 eruption of Mount Pinatubo, 1992 saw a cooling in the global temperatures.
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| 19. | Natib is part of the Western Bataan Lineament volcanic belt which includes the active Mount Pinatubo.
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| 20. | It is as if the surface of the earth around Mount Pinatubo has turned itself inside out.
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