The mesh of the screnn used to sift abrasive grain are listed by the nuber of opening

A stack of sieves covered with a woven mesh material called bolting cloth which can be made of metal and nylon. Size of the bolting cloth opening determines the sizes of ours and throughs. The screen sizes in a sifter generally get smaller from top to bottom.

is the art and science of cultivating the soil, growing crops and raising livestock. it includes the preparation of plant and animal products for people to use and their distribution to markets.

agriculture provides most of the world’s food and fabrics. cotton, wool, and leather are all agricultural products. agriculture also provides wood for construction and paper products.

these products, as well as the agricultural methods used, may vary from one part of the world to another.