| Geology;Age of the earth |
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| • | In
parallel with the field observations that these scientist |
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| made
the question of the age of the earth was long |
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| considered. |
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| • | Many
novel methods were employed to determine the age |
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| of
the earth including studies on the rate of cooling of an |
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| iron
ball and extrapolating to a ball the size of earth, |
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| Mathematical
approaches such as that of the great scientist |
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| William
Thomson (better known as Lord Kelvin) |
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| estimated
the age of the earth, based on loss of heat, to be |
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| less
than 500 million years old. |
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