Named the second-largest volcanic eruption of the 20th century by the U.S. Geological Survey, the sulfuric acidic ash emitted from the 1991 eruption of what volcano in the Philippines caused $700 million in damage and caused global temperatures to drop by more than 0.9 degrees Fahrenheit?

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1. Named the second-largest volcanic eruption of the 20th century by the U.S. Geological Survey, the sulfuric acidic ash emitted from the 1991 eruption of what volcano in the Philippines caused $700 million in damage and caused global temperatures to drop by more than 0.9 degrees Fahrenheit?