火山口即火山喷发时的出口,多位于火山顶端,是形如漏斗的洼地。火山喷发后,火山口渐渐被雨水冲刷而破坏;地下岩浆冷凝、体积收缩,火山口四周也跟着崩坍形成巨大的空洞,随后积 The volcano is the volcano eruption when the exit, mostly in the top of the volcano, is shaped like a funnel depression. After the volcano erupts, the crater is gradually destroyed by rain erosion; the underground magma condenses, the volume shrinks, crater also followed by collapsing to form a huge hole, then plot