Wood

[|WOOD]

 In this unit, we have studied the following topics:  0.Introduction:

 Wood is an organic material, a natural composite of cellulose fibers  embedded in a matrix of lignum.  People have used wood for millennia for many purposes, primarily as a fuel  or as a construction material for making houses, tools, weapons, furniture,  packaging, artwork, and paper.

 1.Age of a tree:

 If you want to know the age of a tree, you have to count the rings of the trunk.

  2.Parts of a trunk:

 The trunk is the main stem of a tree, distinct from the branches and roots. It  has different parts.

 3.How to obtain wood.

 4.Types of wood:

 It is common to classify wood as either softwood or hardwood. The wood <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> from conifers (e.g. pine) is called softwood and is easy to work, and the wood <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> from dicotyledons is called hardwood and is harder than softwood.

<span style="font-family: 'Comic Sans MS',cursive;"> 5.Properties: density, hardness, resistance.

<span style="font-family: 'Comic Sans MS',cursive;"> 6.By products or artificial wood : paper, cardboard and artificial board.

<span style="background-color: #00ffff; font-family: 'Comic Sans MS',cursive; font-size: 130%;"> 7.How to work the wood.

<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> You have to do different actions: <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To measure and mark. <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To hold. <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To cut. <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To file. <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To join. <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> -To end. <span style="font-family: 'Comic Sans MS',cursive;"> 8. Tools for woodworking: (look at the following photocopy)

<span style="font-family: 'Comic Sans MS',cursive;"> 9.How to recycle wood : Recycling involves processing used materials into new <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> products to prevent waste, reduce the consumption of trees, reduce energy usage, reduce <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> air pollution and water pollution. Recycling is a key component of modern waste <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;"> reduction and is the third component of the "Reduce, Reuse and Recycle".

<span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Visit this[| link]