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Tree climbers and tree huggers alike, learn the basics of reading tree rings to find out about the life of a tree.

How Trees Grow ~ The outer bark protects the inner wood layers from injuries, pests & disease. The inner bark (phloem) carries synthesized food from the leaves to the cambium layer & other growing portions of the tree. The cambium layer is where active growth takes place, making more wood & bark. Sapwood (xylem) transports sap - water & nutrients - from the roots to the leaves. The center of the tree, which provides strength & support, is the heartwood (dead wood or inactive wood).

Arborist Tree Climber

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Arborist at work

This chronometric technique is the most precise dating tool available to archaeologists who work in areas where trees are particularly responsive to annual variations in precipitation, such as the American Southwest.Developed by astronomer A. E. Douglass in the 1920s, dendrochronology—or tree-ri

Forensic arborist Christopher Larson discusses physical signs that indicate a tree may be failing, industry specific vocabulary to assist attorneys in better understanding the science of trees, and other issues that may contribute to trees becoming hazardous.