Dating earth meteorites
The passage of time can be charted by the reduction in the number of parent atoms, and the increase in the number of daughter atoms.
There are over forty such techniques, each using a different radioactive element or a different way of measuring them.
This paper describes in relatively simple terms how a number of the dating techniques work, how accurately the half-lives of the radioactive elements and the rock dates themselves are known, and how dates are checked with one another.
In the process the paper refutes a number of misconceptions prevalent among Christians today.
But because God has also called us to wisdom, this issue is worthy of study.
Rocks are made up of many individual crystals, and each crystal is usually made up of at least several different chemical elements such as iron, magnesium, silicon, etc.