![A column of gas and ash rising from Mount Pinatubo in the Philippines on June 12, 1991, just days …[Credits : David H. Harlow/U.S.Geological Survey]](http://media-2.web.britannica.com/eb-media/61/93161-004-E29214F9.jpg)
A column of gas and ash rising from Mount Pinatubo in the Philippines on June 12, 1991, just days before the volcano’s climactic explosion on June 15.
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