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07-Sep-2016 09:44

That only worked for sedimentary rocks, and only some of those.

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The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.The work of geologists is to tell the true story of Earth's history—more precisely, a story of Earth's history that is ever more true.

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A hundred years ago, we had little idea of the story's length—we had no good yardstick for time.Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.



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