The layer of basalt is only a few feet thick.

因?yàn)檫@里的玄武巖層僅有一米多厚

Saladin would also have noted that the castle's made of hard, volcanic basalt.

同時(shí) 他也注意到 城堡由堅(jiān)硬的火山玄武巖筑成

They too are made of basaltic rock, the same rock implicated in the mass extinction of land animals.

它們同樣是由玄武巖構(gòu)成的 同陸地生物大滅絕有著緊密的聯(lián)系

Many rocks, including basalt, have a distinctive magnetic signature, formed as the rock is born.

包括玄武巖在內(nèi)的多數(shù)巖石 都有其特有的磁特性 而這種特性是與生俱來的

2 dozen fistsized basaltic rocks, kindling, a couple of shovels, a pail of water, and all the tarps, quilts, and buffalo skins we can find.

24塊拳頭大小的玄武巖 柴火 幾把鏟子 一桶水 還需要盡量多的防水布 棉被和水牛皮