| 41. | The amount of sulfur dioxide is comparable to the 20 million tonnes of the 1991 eruption of Mount Pinatubo.
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| 42. | The eruption of Mount Pinatubo on June 14, 1991 caused much havoc to Guagua and its neighboring municipalities.
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| 43. | Much of the damage in Luzon centered around the provinces surrounding Mount Pinatubo, a volcano which erupted in 1991.
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| 44. | Clark was closed by U . S . authorities because of extensive damage during the 1991 eruption of Mount Pinatubo.
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| 45. | The haze was particularly bad in 1991, when the eruption of Mount Pinatubo added extra ash to the atmosphere.
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| 46. | Troops were searching Mount Pinatubo for Navy Lt . Scott Alan Washburn of Celina, Ohio, by ground overnight.
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| 47. | The 1991 eruption of Mount Pinatubo is the world's second-largest terrestrial eruption of the 20th century.
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| 48. | Notable lahars include those at Mount Pinatubo and Nevado del Ruiz, the latter of which killed thousands of people.
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| 49. | Mount Pinatubo and the other volcanoes on this volcanic belt arise due to magma occlusion from this subduction plate boundary.
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| 50. | She assisted in Operation Fiery Vigil, the evacuation of civilians from the Philippines during the eruption of Mount Pinatubo.
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