the ratio, in a sample of rock, of the quantity of lead (or a lead isotope) to the quantity of its radioactive parents uranium and thorium (or an…
| 单词 | θ7621 |
| 释义 | the world > the earth > earth sciences > geology > [noun] > dating > ratio (1) lead ratio1920 the ratio, in a sample of rock, of the quantity of lead (or a lead isotope) to the quantity of its radioactive parents uranium and thorium (or an… |
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