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Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.

Each isotope is identified with what is called a ‘mass number’.

The Mayan calendar used 3114 BC as their reference.

More recently is the radiocarbon date of 1950 AD or before present, BP.

The atoms of some chemical elements have different forms, called isotopes.

These break down over time in a process scientists call radioactive decay.

Students will need a 100 'marked' dice (a piece of tape on one side of each) to conduct the "How Old Is That Rock?

Roll the Dice & Use Radiometric Dating to Find Out" hands-on geology project.

A man called Willard F Libby pioneered it at the University of Chicago in the 50's. This is now the most widely used method of age estimation in the field of archaeology.

There are two techniques for dating in archaeological sites: relative and absolute dating.

Relative dating stems from the idea that something is younger or older relative to something else.

We understand centuries based on family trees and history books, and we have a conceptual sense of a few thousand years.

But when it comes to talking about a rock that may be billions of years old, what do we do?

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