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Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.

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We can see how do deal with this if we take a particular case. For example the amount of Rb in mantle rocks is generally low, i.e. The mantle thus has a low If these two independent dates are the same, we say they are concordant.As uranium decays radioactively, it becomes different chemical elements until it stops at lead.The reason for stopping at lead is because lead is not radioactive and will not change into a different element.It may sound straight-forward, but there are many variables that have to be considered.The three main parameters that have to be set are the original amount of uranium and lead in the sample, the rate at which uranium and lead enter and leave the sample, and how much the rate of decay changes.

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Again, it's probably not a great idea to rattle off On her Science of People blog, behavioral investigator Vanessa Van Edwards says this question is a better alternative to "What do you do?