英文寫作翻譯頻道為大家整理的英語作文大全：火山噴發(fā)，供大家參考:)
     A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.