You may be referring to "growth rings", or more commonly, "tree rings." These rings are visible on the horizontal cross sections of trees as concentric sets of circles. The rings mark the growth of the tree through the seasons of a year and one ring usually equals one year of time. Counting the number of rings from the center out to the edge will give you an estimate on the age of the tree.
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They simply used straight edges of wood.
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When wood corrodes it rots. The amount of time wood takes to rots depends on the wetness of the wood, density of the wood, and what the wood is. The location of the wood can also change how fast the wood will rot.
Wood stain is abosorbed into the wood, so the wood takes on the color of the stain. This is why the features of the wood are still visible, unlike with paint.