Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.
The method of reading the order is called stratigraphy (layers of rock are called strata).
Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.
Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.
This method works because some unstable (radioactive) isotopes of some elements decay at a known rate into daughter products.
Half-life simply means the amount of time it takes for half of a remaining particular isotope to decay to a daughter product.
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