The practice of working out the age of wooden structures by studying and counting tree rings. When a tree grows, it puts on new growth under the bark. If the tree is felled, each year’s growth is visible as rings, and by carefully counting them, it is possible to work out how old the tree was when it was felled. Dendrochronology is used, for example, to understand how fast trees and other woody plants grew in the past, perhaps when the climate was different from the current climate.

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