Lord Kelvin based his estimate of Earth's age on how long it must have taken Earth to cool by conduction.

Name: Lord Kelvin based his estimate of Earth's age on how long it must have taken Earth to cool by conduction.
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Lord Kelvin estimated Earth's age by assuming it was once molten, and calculating the time it would take for it to cool to its present temperature by conduction. His estimate, however, was later revised as new information about radioactive decay and thermal convection became available.

Lord Kelvin Based His Estimate of Earth's Age on How