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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.

Their values were consistent with Thomson's calculations.

However, they assumed that the Sun was only glowing from the heat of its gravitational contraction.

Huxley, attacked Thomson's calculations, suggesting they appeared precise in themselves but were based on faulty assumptions.

Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.Studies of strata, the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence.These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer.After Henri Becquerel's initial discovery in 1896, Marie and Pierre Curie discovered the radioactive elements polonium and radium in 1898; and in 1903, Pierre Curie and Albert Laborde announced that radium produces enough heat to melt its own weight in ice in less than an hour.Geologists quickly realized that this upset the assumptions underlying most calculations of the age of Earth.

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In 1895, John Perry produced an age-of-Earth estimate of 2 to 3 billion years using a model of a convective mantle and thin crust, Kelvin stuck by his estimate of 100 million years, and later reduced it to about 20 million years.

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