怀疑者说，迄今发现的大多数化合物来自火山堆积物。

But most of the compounds found so far, say the doubters, come from volcanic deposits.

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火山机构由3个基本要素组成，即火山堆积高地、围斜构造和火山口，在地震剖面和水平切片上反射特征明显。

The accumulation of deep gas is controlled by the volcanic apparatus, which consists of 3 elements: volcanic plateau, pericline and crater, all having clear seismic reflective characteristics.

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熔岩堆积，变硬，于是火山就形成了。

The lava builds up, and hardens, and a volcano forms.

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