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in the history of the Earth to uphold his principles of evolution. He assumed the rate of erosion was around one inch per century and calculated the age of the Weald at around 300 million years. Were that true, he reasoned, the Earth itself must be much older. In 1862, William Thomson (later Lord Kelvin) published a paper "On the age of the sun's heat", in which - unaware of the process of solar fusion - he calculated the Sun had been

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