Reference Terms
from Wikipedia, the free encyclopedia

Growth ring

Growth rings (or "tree rings" or "annular rings") can be seen in a horizontal cross section cut through the trunk of a tree.

Visible rings result from the change in growth speed through the seasons of the year, thus one ring usually marks the passage of one year in the life of the tree.

Note:   The above text is excerpted from the Wikipedia article "Growth ring", which has been released under the GNU Free Documentation License.
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