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Tree Trunk Cross Section Showing Annual Growth Rings Full Frame Stock PhotoTree Ring,Wood Grain,Wood - Material,Full Frame,Tree,Cross Section,Growth,Aging Process,Backgrounds,Time,Continuity,Extreme Close-Up,No People,Development,Outdoors,Color Image,Day,Horizontal,PhotographyPhotographer Dietrich RoseCollection: 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 younger rings are called sapwood.