Tree growth rings

Tree growth rings

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Credit: GUSTOIMAGES/SCIENCE PHOTO LIBRARY

Caption: Growth rings on chopped logs. The growth rings are exposed by cutting across a tree trunk or branch. Each ring represents a period of growth in which the tree formed new wood. Each year the outer part of a tree trunk, the living part, lays down a new layer. The older layer dries out and dies, forming the hard mass of wood in the core of a trunk, the heart wood. Each ring corresponds to a single year and allows the age of the tree to be calculated. A ring varies in width according to the climate that year.

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Keywords: age, annual, botany, branch, chopped, chronological, chronology, cut, dead, dendrochronology, growth ring, living, log, logs, nature, plant, plants, rings, section, sectioned, tree, trunk, wood, yearly

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