Epic of Evolution  

The half-life of an atom is the time in which half the atoms will decay.


Dating Rocks Using Radiometric Dating

How do we know how old the Earth and the rocks on it are?

One method is radiometirc dating. This method measures the relative amounts of radioisotopes and their decay products found in a sample.

The Evolution and Nature of Science web site has an excellent activity for this using the fictional elements "Beanium" and "Cornium."

I've adapted this and have included a worksheet.

This simulation of radiometric dating uses the element "Beanium", which changes into "Cornium."

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