21. Three days of rain last week forced volcanic debris from Mount Pinatubo to cascade down its slopes. 22. Superheated volcanic debris still remain on the slopes around Mount Pinatubo after it erupted in June 1991. 23. U . S . troops abandoned the air field in 1991 when nearby Mount Pinatubo began erupting. 24. For example, the Cabalantian tragedy occurred four years subsequent to the 1991 eruption of Mount Pinatubo . 25. The second is Parua river which originates from Sacobia-Bamban river that comes from Mount Pinatubo . 26. In June 1991, Mount Pinatubo in Central Luzon erupted, after being dormant for 600 years. 27. Clark was abandoned in 1991 after it was buried in volcanic ash by the eruption of Mount Pinatubo . 28. That same year, the eruption of the Mount Pinatubo volcano forced the Air Force to abandon Clark. 29. Provinces surrounding volcanic Mount Pinatubo , which erupted in 1991, would also be spared, they said. 30. After striking Manila, the storm was expected to threaten several northern provinces surrounding the Mount Pinatubo volcano.
