Annual ring

Annual Ring The annual ring is a layer of wood produced by a single year's growth of a tree. The term is used in dendrochronology, the scientific study of dating tree rings, also known as tree-ring dating.

Cross-section of an Oak Log Showing Growth Rings

Formation[edit | edit source]

Annual rings are formed due to the change in growth speed through the seasons of the year, hence the name "annual" ring. The visible difference between the rings is caused by the change in growth speed through the seasons of the year; thus, critical for the title method, one ring generally marks the passage of one year in the life of the tree.

Characteristics[edit | edit source]

The characteristics of annual rings vary depending on the species of tree, the local environment, and other factors. For example, in temperate regions, trees typically produce one growth ring each year, with the newest adjacent to the bark. In tropical regions, trees may produce two or more growth rings per year.

Uses[edit | edit source]

Annual rings are used in dendrochronology to date events (climatic changes) in the environment where the tree grew. They are also used in forestry to estimate the age of trees, and in archaeology to date wooden objects.

See also[edit | edit source]

Annual ring Resources
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