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Mount Pinatubois an active stratovolcano located on the island of Luzon in the Philippines. Before 1991, the mountain was inconspicuous and heavily eroded.
The volcano's eruption in June 1991, more than 490 years after the last known eruptive activity produced the second largestterrestrial eruption 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 as 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 ejected roughly 10 billion metric tons of magma, and 20 million tons of suplur dioxide, bringing vast quantities of minerals and metals to the surface environment. It injected large amounts of aerosols into the stratosphere. Over the following months, the aerosols formed a global layer of sulphuric acid haze. Global temperatures dropped by about 0.5 degree celsius, and ozone destruction increased substantially.