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Bisected Tree Trunk Section Through Showing Rings Stock PhotoTree Ring,Circle,Growth,Continuity,Tree Trunk,Black Background,Black Color,Color Image,Concentric,Cross Section,Cut Out,Day,Directly Above,Horizontal,Ideas,Natural Pattern,No People,Photography,Single Object,Studio Shot,TimePhotographer Peter SamuelsCollection: The Image Bank Annual growth rings show the growth of a tree each year. The width of each ring is affected by climate and other environmental variables. Older rings, which are usually darker and non-functional, are called heartwood. The young rings are called sapwood.