pyroclastic rock

例句：

1. 1.The pyroclastic rock was formed by the eruption of a volcano.
   这种火山岩是由火山爆发形成的。
2. 2. The pyroclastic rock is rich in minerals and can be used for construction.
   这种火山岩富含矿物质，可用于建筑。
3. 3.The pyroclastic rock is dangerous to handle, as it can cause explosions.
   这种火山岩危险，因为它可能会引发爆炸。