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Mount Pulong Bato
Mount Pulong Bato is a monolith located in Zamboanga City at the Zamboanga Peninsula, the western tip of the island of Mindanao in the Philippines. The mountain is situated in the Upper Abong-Abong Park within the Pasonanca Natural Park, in Barangay Pasonanca, only a few kilometers away from the city's downtown section.
== Geology ==
Pulong Bato became infamous because when the Philippine Institute of Volcanology and Seismology (PHIVOLCS) confirmed the mountain is a volcano which is unknown to most people. What is unusual about the mountain is, unlike the other mountains surrounding the city, only Mt. Pulong Bato is made from solid rock.
〔Feliciano, Jun (2005-01-07). ("City has extinct volcano" ). Zamboanga Sunstar.〕
According to PHIVOLCS, the volcano is an Intrusion type of volcano meaning it was formed within earth's crust. Magma was pushed from the beneath the earth surface but did not come out through an eruption like a typical volcano (Extrusion). The magma eventually solidified while it is still enclosed by softer rocks, which was later exposed by erosion or weathering, a process that could take thousands of years.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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