Start Radiometric dating parent to daughter ratios

Radiometric dating parent to daughter ratios

In 1892, Thomson had been made Lord Kelvin in appreciation of his many scientific accomplishments.

This was a challenge to the traditional view, which saw the history of Earth as static, He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface to cool to its present temperature.

His calculations did not account for heat produced via radioactive decay (a process then unknown to science) or, more significantly, convection inside the Earth, which allows more heat to escape from the interior to warm rocks near the surface.

material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.

For biologists, even 100 million years seemed much too short to be plausible.

In Darwin's theory of evolution, the process of random heritable variation with cumulative selection requires great durations of time.

giving a lower limit for the age of the solar system.