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Where there is little seasonal difference growth rings are likely to be indistinct or absent.
If the bark of the tree has been removed in a particular area, the rings will likely be deformed as the plant overgrows the scar.
Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants.
It is an organic material, a natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin that resists compression.
Known Constructions using wood date back ten thousand years.
Buildings like the European Neolithic long house were made primarily of wood.
If there are differences within a growth ring, then the part of a growth ring nearest the center of the tree, and formed early in the growing season when growth is rapid, is usually composed of wider elements.
It is usually lighter in color than that near the outer portion of the ring, and is known as earlywood or springwood.
New Zealand, growth can occur in a discrete annual or seasonal pattern, leading to growth rings; these can usually be most clearly seen on the end of a log, but are also visible on the other surfaces.If the distinctiveness between seasons is annual (as is the case in equatorial regions e.g.Singapore), these growth rings are referred to as annual rings.In grading lumber and structural timber, knots are classified according to their form, size, soundness, and the firmness with which they are held in place.This firmness is affected by, among other factors, the length of time for which the branch was dead while the attaching stem continued to grow.