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A tree's age can be dated to within one year by "counting" the number of these rings that a tree possesses.However, just counting the rings may lead to an inaccurate result, because of seasonal variations in ring growth and malformations.Adequate moisture and a long growing season result in a wide ring. Alternating poor and favorable conditions, such as mid summer droughts, can result in several rings forming in a given year.

By counting the thin bands (annual rings) on the wood cylinder, the approximate age of the tree can be determined.

A small core of the wood is removed and the rings are painstakingly counted.

This remarkable tree was approximately 1400 years old, and grew on this rugged mountain ridge during the time of Mohammed.

Instead, dendrochronologists determine the qualities of each ring and determine whether other local trees possess the same qualities in the same ring in a process called "skeleton plotting".

If the tree rings between different trees formed in a similar way, then it's likely that those trees have undergone the same variation at the same time.