Dendrochronology is a scientific method of dating by studying the patterns of the growth rings in trees.
Trees have a single, thick and woody stem. If you look at the trunk of a tree that has been cut, you will see that it has a pattern of rings on it.
Each ring is made up of a new layer of tissue that is added every year. So, each ring represents a year of the tree’s growth.
Dendrochronologists are scientists who study the rings of trees. They use annual rings to date events in history – both in the history of the tree, and of the natural world.
Using dendrochronology, it is possible to date wood as far back as thousands of years.