ocr: THE RING OF FIRE There are 540 historically active volcanoes worldwide, 75% of which lie on a crescent around the Pacific Ocean. U.S.S.R. Alosko. CANADA Mount St. Helens 1980 U.S. Mount Redoubt 1989 CHINA - Mount 1707 Fuji, Mount Kotmoi - 1912 El Chichon, 1792. and 1991 1982 MOUNT UNZEN (dotes indicote mojor eruptions) JAPAN Nevodo del Ruiz. Howaii 1985 AYSIAC MOUNT PINATUBO HOW PLATE MOVEMENT CAUSES VOLCANOES PHILIPPINES 1991 13005 and When two of the earth's plates collide at convergent boundaries, one plate slides under the other. As - the sinking, plate reaches deep. into the earth's mantl ...
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