他那破窗旧铁般的房子没有门牌，所在的火山灰堆积的街道虽是哥马城市中心，但也没有名称。
His corrugated iron house had no number and his volcanic ash street in the heart of Goma had no name.
接踵而至的火山岩在遇到已冷却的熔岩时便被阻隔堆积起来，由此渐渐构成一个球茎状的岩石块。
The cooled lava ACTS as insulation for the lava coming behind it, and the form slowly grows into a bulbous-like chunk of rock.
这个层状火山是由稠密的熔岩流以及火山灰和岩石碎片等喷发物所形成的连续层堆积而成的锥形火山，它位于一个更老的层状火山之上。
The current stratovolcano-a cone-shaped volcano built from successive layers of thick lava flows and eruption products like ash and rock fragments-is built on top of an older stratovolcano.
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