标题: 描写火山喷发的英语作文200字 [打印本页] 作者: admin 时间: 2012-12-13 13:51 标题: 描写火山喷发的英语作文200字 描写火山喷发的英语作文200字
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.