wood
Wood is a sub-grown plant, such as trees and shrubs, formed by lignified tissues. Is a porous fibrous tissue. Trees and shrubs After the primary growth, the vasculature in the rhizomes begins to move, developing phlooms outward, and developing wood inward. Wood is the formation of the vascular layer inward development of plant tissue collectively, including xylem and wood lines. Wood for the main products of the forest, for human life plays a great role in support. Depending on the nature of the wood, they are used in different ways, such as fuel and building materials. Wood is a natural organic composite material, composed of cellulose fibers (strong tensile strength) and lignin matrix (strong compressive strength). General wood is defined as the xylem of the secondary growth of the stem. There are about one million tons of wood on earth, about 10 million tons a year. The large reserves of wood, and carbon neutral renewable materials, is one of the most interesting renewable energy. In 1991, about 3.5 million cubic meters of wood were produced, mainly for furniture and building structures. ...