Ash,Volcanic

《英文msh詞典》Ash,Volcanic
[入口詞] Ash,Volcanic
[主題詞] Volcanic Eruption
[英文釋義] The ash,dust,gases,and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor,and carbon dioxide,sulfur dioxide,hydrogen,carbon monoxide,and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms,4th ed)