Tree Trunks
Tree Trunk in Cross Section
Special thanks to the Microsoft Corporation for their contribution to our site. The following information came from Microsoft Encarta.
As the trunk of a tree expands with secondary growth, new phloem forms on one side of the cambium tissue, and new
xylem on the other. This secondary xylem is known as wood.
Microsoft Illustration
Tree Trunk in Cross Section," Microsoft® Encarta®.
Copyright © 1993-2002 Microsoft Corporation
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