Volcano were proposed for volcano behavior before the modern understanding of the Earth's mantle structure as a semisolid material was developed. For decades after awareness that compression and radioactive materials may be heat sources, their contributions were specifically discounted. Volcanic action was often attributed to chemical reactions and a thin layer of molten rock near the surface. Volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major,
Cabalian Volcano Cabalian Volcano Cabalian Volcano("Kabalianon: Bukid Kantayoktok)" is an active volcano located in the province of Southern Leyte (Region VIII) in the Philippines. Cabalian is classified by the Philippine Institute of Volcanology and Seismology (PHIVOLCS) as active with solfataric activity. Radiocarbon dating on a pyroclastic flow deposit from the volcano estimated that the last eruption was in 1820 +/- 30 years. The cinder cone volcano has an elevation of with a base diameter of . The predominant rock type is andesite. Beside solfataras, other thermal features present are hot springs located on the east and west flank of the volcano. Mainit