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17-Oct-2017 06:03

Between 18 he elucidated the complex sequence of chemical reactions attending the precipitation of salts (evaporites) from the evaporation of seawater.Van ’t Hoff’s aim was to explain the succession of mineral salts present in Permian rocks of Germany.Love and hate were considered principles of attraction and repulsion that alternately dominated the universe in a recurring cycle.Empedocles presented a kind of biological theory of natural selection in an imaginative poem, On Nature.

Working at the Geophysical Laboratory of the Carnegie Institution of Washington, D. Experimental petrology, both at the low-temperature range explored by van ’t Hoff and in the high ranges of temperature investigated by Bowen, continues to provide laboratory evidence for interpreting the chemical history of sedimentary and igneous rocks.

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Bertram Boltwood suggested that lead is one of the disintegration products of uranium, in which case the older a uranium-bearing mineral the greater should be its proportional part of lead.

Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase with age.

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After estimating the rate of this radioactive change, he calculated that the absolute ages of his specimens ranged from 410 million to 2.2 billion years. Wasserburg applied the mass spectrometer to the study of geochronology.Epicurus - Greek philosopher; founded the system known as Epicureanism.