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giving a lower limit for the age of the Solar System.

Geologists such as Charles Lyell had trouble accepting such a short age for Earth.Kelvin calculated the age of the Earth by using thermal gradients, and he arrived at an estimate of about 100 million years.He did not realize that the Earth mantle was convecting, and this invalidated his estimate.For biologists, even 100 million years seemed much too short to be plausible.In Darwin's theory of evolution, the process of random heritable variation with cumulative selection requires great durations of time.

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