Mount Pinatubo is an active volcano located on the island of Luzon in the Philippines, at the intersection of the borders of the provinces of Zambales, Tarlac, and Pampanga. Before 1991, the mountain was inconspicuous and heavily eroded. It was covered in dense forest which supported a population of several thousand indigenous people, the Aeta, who had fled to the mountains from the lowlands when the Spanish conquered the Philippines in 1565.
The volcano's recent eruption in June 1991 came after 500 years of dormancy, and produced one of the largest and most violent eruptions of the 20th century. Successful predictions of the onset of the climactic eruption led to the evacuation of tens of thousands of people from the surrounding areas, saving many lives, but the surrounding areas were severely damaged by pyroclastic flows, ash deposits, and later, lahars caused by rainwater remobilising earlier volcanic deposits. Thousands of houses were destroyed.
The effects of the eruption were felt worldwide. It injected large amounts of aerosols into the stratosphere—more than any eruption since that of Krakatoa in 1883. The aerosols formed a global layer of sulfuric acid haze over the following months. Global temperatures dropped by about 0.5 °C (0.9 °F), and ozone destruction increased substantially.
More on [ Mount Pinatubo ]

Fire and Mud - U.S. Geological Survey online book about the eruptions and lahars of Mount Pinatubo, Philippines.
Mount Pinatubo - Maps, images, background information, and eruption information from the USGS Cascades Volcano Observatory.
Mt. Pinatubo Eruption, 1991 - Site of Capt. Randal L. Carr, Disaster Preparedness Officer at Clark Air Force Base, offers a collection of photographs of the volcano and damage done to buildings and neighborhoods and his official journal entries.
Photos of the Devastation on Base from the Mount Pinatubo Eruption - A collection of photographs of damage caused by the 1991 eruption to the now-closed U.S. Naval Base at Subic Bay, Philippines.
The Eruption of Mt. Pinatubo Archives - Photographs, scanned newspaper and magazine articles, and video clips covering the 1991 eruption. From the Wagner High School (Clark Air Force Base) Alumni site.
The Sleeping Giant Awakens - Gateway for information about the mountain's lore, pre-eruption manifestations, accounts of the 1991 eruption, and the aftermath.
Volcano World: Pinatubo, Philippines - General information and photographs from the 1991-1992 eruption, as well as links to additional images and resources. Sponsored by the University of North Dakota.
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