有时，动物和植物被浸泡在焦油或流沙中，被困在冰或熔岩流中，或被迅速落下的火山灰吞没后被保存下来。
On occasion, animals and plants have been preserved after becoming immersed in tar or quicksand, trapped in ice or lava flows, or engulfed by rapid falls of volcanic ash.
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.
杀伤机制：火山灰、火山碎屑流。
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