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.
They are both important in terms of Earth's history and its geological timeline, and they work together in concert to build the planet's geological record.
In this lesson, we're going to discuss what each type of time is and why it is important so that you too can understand how they work to describe past events on Earth. Let's start with absolute time, also called chronometric time ('chrono' means 'time' and 'metric' means 'measure').
You can think of this type of time as how we normally view it on a day-to-day basis: specific intervals or moments measured in days, months, years, etc.
For example, 60 million years is a measure of absolute time. These are numerical representations of time, and they give us specific points of reference.
We have a long record of events in absolute time but much of that occurred before humans were on Earth to write it down.