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Tree Trunk Cross Section Showing Annual Growth Rings Full Frame Stock PhotoAging Process,Backgrounds,Color Image,Continuity,Cross Section,Day,Development,Extreme Close-Up,Full Frame,Growth,Horizontal,No People,Outdoors,Photography,Time,Tree,Tree Ring,Wood - Material,Wood GrainPhotographer 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.