我们脚下深处是地狱般的岩石汤，在温度非常高的地球地幔中，有毒的铀、钍和钾元素的同位素释放出的辐射流不断地对这些岩石汤进行加热，使其保持高温。
Deep underneath your feet is a hellish stone soup, kept hot by a torrent of radiation from poisonous isotopes of uranium, thorium and potassium in the earth's superheated mantle.
因为它是稀有天然放射性同位素钾衰变而产生的，所以可以用来测定十万年以上的岩石年龄和采样。
Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.
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