1908 and rutherford and radiometric dating

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In 18, John Joly of the Trinity College, Dublin calculated the rate at which the oceans should have accumulated salt from erosion processes, and determined that the oceans were about 80 to 100 million years old.Rock minerals naturally contain certain elements and not others.

Because the exact accretion time of Earth is not yet known, and the predictions from different accretion models range from a few millions up to about 100 million years, the exact age of Earth is difficult to determine.These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer.In the 1790s, the British naturalist William Smith hypothesized that if two layers of rock at widely differing locations contained similar fossils, then it was very plausible that the layers were the same age.He calculated the amount of time it would have taken for tidal friction to give Earth its current 24-hour day.His value of 56 million years added additional evidence that Thomson was on the right track.

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