Word: sediments
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Dates: during 1960-1960
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...John Rosholt of the U.S. Geological Survey and Italian-born Dr. Cesare Emiliani, it depends on the fact that a tiny amount of uranium is dissolved in all sea water. When it slowly decays radioactively, it yields protoactinium 231 and thorium 230, both of which attach themselves to sediment particles and sink slowly to the bottom. There they in turn decay, but protoactinium 231 decays faster than thorium 230. The age of sediment on the ocean floor can therefore be determined by measuring the relative abundance of the two isotopes...
...proud, too much the unbending leopard on his own family crest, to be able to lick his wounds by joining those who inflict them. In the mid-span of his life he courts oblivion ("While there's death there's hope"), and measures out the ''sediment of grief which, accumulating day by day, would in the end be the real cause of his death...