火山的岩烬

例句：

1. 1. The volcano erupted with a massive explosion of ash and gas.
   火山爆发了，喷出了大量的灰烬和气体。
2. 2. The mineral deposit is composed mainly of igneous rocks.
   这个矿床主要由岩浆岩组成。
3. 3.The igneous activity in the region has been causing concern for years.
   该地区的岩浆活动多年来一直引起人们的担忧。