On June 15, 1991, Mount Pinatubo in the Philippines blew its top in an eruption of staggering proportions. It sent an ash cloud 28 miles high, filling surrounding valleys with deposits 660 feet thick and destroying almost every bridge within 18 miles. Over 800 people lost their lives. The volcano also ended up affecting humans all over the world. Its aerosols circled the Earth, reducing direct sunlight by 21 percent.

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