1. The amazing Facts about Wood Prepared By : Zheng Yang

2. Wood in the early days Wood is used for making fire,weapons,etc. Wood provided economical and commercial purposes Wood served for religious purposes

3. Growth Rings Growth rings can be seen from the end of logs Where there are clear seasons, this can happen in a discrete pattern If these seasons are annual these growth rings are annual rings. If there is no seasonal difference, growth rings are likely to be indistinct or absent.

4. Heartwood Heartwood is wood that has died and become more resistant to decay as a result of deposition of chemical substances (a genetically programmed process). It appears in a cross-section as a usually colored circle, usually following the annual rings in shape. Heartwood is usually much darker than living wood, and forms with age.

5. Knots A knot is actually a portion of a side branch. The included portion is irregularly conical in shape The tip at the point in stem diameter at which the plant's cambium was located when the branch formed as a bud. Within a knot, the fiber direction (grain) is up to 90 degrees different from the fibers of the stem

6. Questions? Now, do you all have any questions?