TIMBER GROWTH AND FELLING
Wood is obtained from trees. When it has not been processed for use, it is typically referred to as timber. Trees are renewable materials, although they grow very slowly, some good quality hardwoods require 50 or more years to mature.…
WOOD PRESERVATION
Because the sapwood of trees contain water, food, salts, air and warmth, wood is often attacked by fungi, termites, insects and other pestiferous organisms. Since woods usually contain varying amounts of these substances, the rate of attack differs with wood…
CORAL REEFS
In tropical seas many kinds of coral animals and marine organisms such as coral polyps, calcareous algae, shell-forming creatures and lime-secreting plants live in large colonies. Though they are very tiny creatures, their ability to secrete calcium carbonate within their…
THE FORMATION AND ORIGIN OF LAKES
Lakes are amongst the most varied features of the earth’s surface. They occupy the hollows of the land surface in which water accumulates. They vary tremendously in size, shape, depth and mode of formation. The tiny ones are no bigger…
ISLANDS
An island is a piece of land surrounded on all sides by water. It may occur individually or in a group, in open oceans or seas. Smaller ones of only local significance are found even in lakes and rivers. Generally…
LAKES AND MAN
A careful examination of the lakes of the world will reveal their immense human significance. In countries where they are found in abundance, such as Finland, Canada, U.S.A ., Sweden and the East African States, lakes, together with other inland…
BASIC ELECTRONIC DEVICES
Electronics is concerned with the theory design, and application of devices to control streams of electrons moving through solids, liquids, gases, and spaces, which are free of air (vacuums). Electronics is a very wide field. It is a specialized branch…
SIMPLE METAL WORK PROJECTS
Metal Finishing Metal finishing refers to any of the techniques used to create a decorative or protective surface on a metallic surface. Metals differ in their degree of luster. They range from very dull to very bright. Finishing is used…
CONCEPT OF TECHNOLOGY
The word technology refers to ways of making or doing things. It includes all the methods through which people use their inventions and discoveries to satisfy their needs and wants. Over a very long period of time, people all over…
INTRODUCTION TO METALWORK MACHINES
Introduction Metalwork is the process of working with metals to create individual parts, assemblies or large-scale structures. Types and Functions of Metalwork Machines There are different types of metalwork machine, which include a wide variety of equipment used to…
USES OF COSMETICS AND DEODORANTS
Regular use of deodorants is important. Young people however require very little make-up because they still have natural beauty and complexion. They may decide to use make-ups at later age to hide blemishes and wrinkles. It is necessary that you…
HYDRAULIC AND PNEUMATIC MACHINES
Introduction In many industries, there are three main methods for power transmission from one point to another. They are electrical transmission, which is through wire and transformers; mechanical transmission, which is through shafts, gears, belts, chains etc.; and the last…
HEALTHY FEEDING HABITS
The human body is like a machine. It therefore needs fuel to do its work. It also needs good maintenance and regular repair. These needs are met by the food we eat. It is therefore important that you know the…
GEARS
Introduction A gear is a toothed machine part, such as a wheel or cylinder, that meshes with another toothed part to transmit motion or to change speed or direction or it can be a complete assembly that performs a specific…
FIRST AID
Introduction When working or playing in any environment, accidents or injuries usually occur, hence, the need for first aid treatment. First Aid: Meaning and Materials First aid is the immediate and temporary care given to a victim of an…
NON-COMMUNICABLE DISEASES
Introduction Diseases distrupt the normal functioning of the body. They are manifested by a characteristic set of signs and symptoms. Diseases can be prevented by early detection, treatment, monitoring and management. Meaning of Non-communicable Diseases Non-communicable diseases also known…
WOODWORK MACHINES
All machines are tools that help people to make things or make work easy. A woodwork machine is a machine that is used to process wood. Woodworking is an art or process of making items from wood. There are two…
BELT AND CHAIN DRIVES
A belt drive system is a method of transferring rotary motion between two shafts. A belt drive includes one pulley on each shaft and one or more continuous belts over the two pulleys. The motion of the driving pulley is…
RESCUE OPERATIONS
People are often involved in dangerous or harmful situations. They therefore, need to be saved or rescued from such situations to prevent loss of lives and property. Meaning of Rescue Operations Rescue operations are responsive operations usually involving the…
THERMAL ENERGY
Introduction Thermal energy simply means heat energy. The sun is the largest source of thermal energy to the Earth. Virtually all life on the earth rely on the sun’s energy, which reaches us in a vast spectrum of wavelengths –…
KINETIC ENERGY ASSUMPTIONS
The question about what things are made of started as far back as the 5th century B.C. when a Greek Philosopher, Democritus, first expressed his opinion that matter is made up of indivisible tiny particles which he called atoms. Scientists…
Study Guide
