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♤ Inside the trunk of a tree there are a number of growth rings.
♤ Each year of the tree’s life, a new ring is added so it is referred as the annual rings.
♤ It is used to calculate Dendro-Chronology (Age of a tree) and Paleo-Climatology.
♤ The age of a tree can be determined by the number of growth rings. The size of the growth ring is determined in part by environmental conditions - temperature, water availability.