地壳最终成为一个僵化的屋顶，形成了熔岩管。
The crust eventually becomes a rigid roof, forming a lava tube.
因为有沿熔岩隧道管，形成了印度一些地方的屋顶坍塌，有可能进入一端出来的另一面。
Because there were roof collapses at several places along the lava tube that formed Indian Tunnel, it is possible to enter on one end and come out the other side.
这些管是由火山的熔岩流出后形成，他争辩。
These tubes were formed after the flow of lava from volcanoes, he contended.
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