What is radioactive dating based on

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.

Simply counting the number of rings will give one a fairly good idea of the age of the tree.

Isotope: A version of an atom that differs from other atoms of the same element only in the number of neutrons.

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.

Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.

When a tree is cut down, these periods are exhibited in a cross section of the trunk in the form of rings.

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Lyell's extreme form of uniformitarianism would have required a perfect balance between heat production and heat loss.

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