If one stamps on the congealed lava nearby, one will hear hollow thumps coming up from underground, as there is a huge cavity underneath caused by the crusting of the surface of the lava flow while it was still moving in molten form underneath.

• 在石龙脊上跺脚，能听到“空空”的声音，下面是一个巨大的熔洞。 灼热的岩浆奔流时，外面的首先冷却结壳，而里面仍在流溢，这样就形成了巨大的空腔。