Tree Rings

As you can see, this tree is about 29 years old.

Scientists can tell the age of a tree by looking at the rings because not only do trees grow taller, they grow thicker also. Everytime the tree grows thicker, it creates a new ring. This is important because it tells you how long the tree has been alive, and sometimes it shows things that have happened to the tree throughout its life. This would be an example of absolute dating because each ring represents a certain amount of years.