GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Growth rings of a tree. Cross-section through a tree trunk showing annual growth rings. Growth rings are visible in a cross-section of a tree trunk after the tree has been felled. Rings are the result of differing rates of growth throughout the seasons of the year. One ring marks one year in the life of the tree. The more rings the tree has, the older it is.
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