SOME VOLCANIC ERUPTIONS AND DISTRIBUTION OF VOLCANOES IN THE WORLD
In the history of mankind perhaps the most disastrous eruptions were those of Mt. Vesuvius, Mt. Krakatoa and Mt. Pelee. Mt. Vesuvius Mt. Vesuvius, standing 1200m (4000 feet) above the Bay of Naples, erupted violently on 24 August A.D.…
PROCESSING OF RUBBER AND PLASTICS
A) Plastic Plastics are manufactured through the combination of several different compounds obtained chiefly from cellulose, coal and petroleum. There are numerous techniques or methods for producing plastic objects. Some of these are Blow moulding, Injection moulding, Rotational moulding, Thermoset…
PROCESSING OF CERAMICS
A) Methods of Making Clay In order to process ceramics, mud, or clay is obtained and cleared of all plant material, stones, paper, metal scraps, wooden pieces and other impurities. Afterwards, it is mixed with water and thoroughly pounded until…
PROCESSING OF METALS
Many metals do not naturally exist in a free state in the ground. They occur in association with other substances collectively referred to as impurities. The combination of these impurities and the metal is referred to as the ore. It…
COMMON TIMBER DEFECTS
A defect is anything present in wood, which results in the lowering of its quality or value. A defect can be caused by the action of man, insects, and fungi or may naturally occur in the growing tree. Some defects…
Study Guide
