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

Strata Thickness- In the late 1800s, a British geologist estimated that 75 million years has lapsed since the beginning of the Cambrian.

Living in France and Northern California, Teo Spengler is an attorney, novelist and writer and has published thousands of articles about travel, gardening, business and law.

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In fact, Archbishop Usher of Ireland calculated that the Earth was created at 9 AM on It was believed that prior to the Great Flood, Earths surface was flat and its climate was mild.

Mountains, erosion, and variations in climate were considered to be punishment for the sins committed by humanity.

Buffon's Iron Sphere Experiments- On the basis of iron sphere cooling experiments, Frenchman Georges de Buffon estimated that the Earth would have needed 75,000 years to cool to its present temperature.

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.

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The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth.The equation is the one which describes radioactive decay: If one of these assumptions has been violated, the simple computation above yields an incorrect age.Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.There are well-known methods of finding the ages of some natural objects.Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.