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He calculated the modern rate of salt delivery to the oceans, and suggested that the present salinity of ocean water would take at least 100 million years to develop.In the 1860's, English physicist Lord Kelvin disagreed with Charles Lyells proposition that the earth behaves in a uniform, unchanging manner.Mountains, erosion, and variations in climate were considered to be punishment for the sins committed by humanity.

near Dusseldorf, Germany uncovered a skull and bones.

Kelvin knew that the Earth gets hotter with increasing depth (the geothermal gradient), and took this observation as evidence that the Earth is cooling off. Chamberlain challenged Kelvins assumption that the earth started as a molten body.

He believed the Earth started off as a molten mass and subsequently transformed to a hot solid mass during cooling. Instead, Chamberlain proposed a model of cold accretion for the Earth.

The quantitative approach is admirable, but Buffon's assumptions are flawed. Silicate minerals have lower heat conductivity than steels and are better insulators leading to slower cooling rates.

Second, the calculations did not incorporate the heating effects of radioactive decay.

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