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Tree Trunk Cross Section Showing Annual Growth Rings Full Frame Stock PhotoAging Process,Circle,Color Image,Concentric,Cross Section,Day,Extreme Close-Up,Full Frame,Growth,Horizontal,Indoors,No People,Photography,Time,Tree Ring,Tree Trunk,Zen-likePhotographer 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 young rings are called sapwood.