Radioactive dating - how does it tell us how old rocks are?

Rocks can contain radioactive elements that breakdown (decay) over time at a set rate.  We can use this decay to work out the age of the rocks.  In this episode, we do a brief look at the process, and how we know it works.<br/><br/>Visit our Members Section - Over 90 teaching resources that are classroom-ready to help you teach Earth science. Check them out!<br/><br/>Support the show