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Lessons and Activities Site Map | Glossary | Lessons and Activites Main Page

The trunk of a tree is the the part that's above ground before the branches start.

Underneath the bark, there is a thin layer of cells called the cambium (pronounced "cam-bee-um").

The cambium cells divide and make new wood on the inside and new inner bark on the outside. In this way, a tree gets bigger around as it grows!

A tree needs to get wider around as it grows. As a tree gets bigger, it needs more and more support to keep it from falling. The large tree trunk is what keeps the tree from falling!

Below is a photograph of a tree trunk unwrapped. You can click on the picture to see the full-sized image. Can you identify the inner bark, the cambium, and the wood?

How do the roots expand into the soil?

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