Classification of Drug; Drug Abuse

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<h1><strong>CLASSIFICATION OF DRUGS AND DRUG ABUSE</strong></h1> CONTENT <ol> <li>Classification of Drugs</li> <li>What is Drug Abuse?</li> <li>How Drugs Can be Abused</li> <li>Misuse of Drugs</li> <li>Other Substances that Can be Abused<strong> </strong></li> </ol>   <h2><strong>Classification of Drugs </strong></h2> There are five classes of drugs that people mostly abuse, namely: (i)<strong> Narcotics</strong> e.g. Opium (ii)<strong> Sedatives and Hypnotics</strong> e.g. Barbiturates (iii)<strong> Tranquilizers</strong> e.g. Valium (iv)<strong> Hallucinogens</strong> e.g. LSD (Lysergic acid diethylamide) and Marijuana. (v)<strong> Stimulants</strong> e.g. Amphetamine, Cocaine

Gravitational Force and Weightlessness

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<h1><strong>GRAVITATION AND WEIGHTLESSNESS</strong></h1> CONTENT <ol> <li>Meaning of Gravitation</li> <li>Effect of Gravitation on Objects</li> <li>Weightlessness</li> </ol>   <h2><strong>Meaning of Gravitation</strong></h2> Gravitation is a type of force that acts on a body across a distance, without any contact between the source and the body. The earth exerts a gravitational force on bodies by which it pulls these bodies towards its centre. This is why fruits fall to the ground from the tree and do not rise upwards. Also, when a stone is thrown upwards it soon stops its upward movement and starts to fall back to the earth. The force of gravity is a universal force. It exists between the earth and bodies and between planets and stars. <strong>Gravitational pull determines the weight of objects.</strong> The amount of force with which gravity pulls an object depends on three things, namely:

Environmental Pollution: Water Pollution

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<h1><strong>ENVIRONMENTAL POLLUTION - WATER POLLUTION </strong></h1> CONTENT <ol> <li>Definition of Pollution</li> <li>Types of Pollution</li> <li>Water Pollution</li> <li>Causes of Water Pollution</li> <li>Consequences/Effects of Water Pollution</li> <li>Control Measures of Water Pollution</li> </ol> <br> <h2><strong>Definition of Pollution</strong></h2> The discharge of waste substances into the environment in quantities that are harmful to human beings is known as <strong>pollution</strong>. The materials and energy that cause pollution are called <strong>pollutants</strong>. Examples of pollutants are Acids, Soaps and Detergents, Alcohol, Oils, Chemical compounds such as Lead, Sulphide, fertilizers, herbicides, refuse and sewage etc. making the environment undesirable, unpleasant, threatening the health and existence of living organisms including humans. <h2><strong>Types of Pollution</strong></h2> There are mainly three types of pollution namely: (i) Water pollution; (ii) Air pollution; (iii) Land or Soil pollution   <h3><strong>Water Pollution</strong></h3>

The Earth in Space

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<h1><strong>THE EARTH IN SPACE</strong></h1> CONTENT <ol> <li>The Solar System</li> <li>The Eight Planets</li> <li>Earth's Rotation and Revolution</li> <li>Eclipse of the Sun and the Moon</li> </ol>   <h2><strong>The Solar System</strong></h2> The planet earth, on which we live, is moving through space all the time. It is going round the sun. In doing this it carries us all through space. The earth travels through the space but we do not realize this because the air around the earth is carried along with it. The sun together with all the bodies which revolves round it makes up the solar system. The solar system consists of the sun, eight planets and their moons along with dwarf planets, comets and asteroids which revolve round the sun. The solar system is divided into inner and outer parts. The inner part contains the Sun, Mercury, Venus, Earth and Mars while the outer part contains Jupiter, Saturn, Uranus and Neptune. The two parts are demarcated by asteroid belt.

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