11. Clark was abandoned by American troops during the June 1991 eruption of nearby Mount Pinatubo . 12. The Philippines'21 active volcanoes include Mount Pinatubo on the main island of Luzon. 13. Washburn said he spent Tuesday night on Mount Pinatubo after his group encountered the guerrillas. 14. Near Mount Pinatubo , the United States maintained two large military bases in the region. 15. The bigger VEI-6 eruptions are comparable to Mount Pinatubo 's 1991 eruption. 16. Wing reservists pitched into to assist survivors of Mount Pinatubo eruption in Operation Fiery Vigil. 17. The base was abandoned by the Americans at the height of the eruption of Mount Pinatubo . 18. With the 1991 eruption of Mount Pinatubo , 1992 saw a cooling in the global temperatures. 19. Natib is part of the Western Bataan Lineament volcanic belt which includes the active Mount Pinatubo . 20. It is as if the surface of the earth around Mount Pinatubo has turned itself inside out.
