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FOREST

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  FOREST     Forests  are very  important  and grow in many places around the world. They are an ecosystem which includes many plants and animals. Temperature and rainfall are the two most  important  things for  forests . ... No  forests  exist in deserts, just a few trees in places where their roots can get at some underground water. Uses of Forest Tree Species in some SADC countries Both exotic and indigenous forest trees species that provide goods and services such as firewood, fruits, timber, poles, fodder, environmental protection, amenities in individual SADC countries were identified in the country reports. 1 Trees in agroforestry systems Both indigenous and exotic tree species are used in agroforestry systems. The species are either deliberately planted or are managed within their natural habitat to improve their productivity. Among the most important indigenous tree species include the African acacias ( Acacia erioloba, A. karroo, A. nilotica, A. senegal,
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Chapter 3

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                            Air: It is the breath of life! The earth has a blanket of air! Earth is the only known planet with an atmosphere that can support life. The atmosphere is a blanket of gases surrounding the earth. Atmosphere: What does it contain?  Two gases make up the bulk of the earth's atmosphere by volume: nitrogen(78 per cent) and oxygen(21 per cent). The remaining one per cent is composed of' 'trace' gases, the most prevalent of which is argon. The rest of the trace gases, although present in only minute amounts, are very important to life on earth.Two in particular, carbon dioxide and ozone, have a large impact on atmospheric processes.Another gas, water vapour, also exists in small amounts. It varies in concentration from being almost non-existent over desert regions to about 4 per cent over the oceans. Water vapour is important in the formation of weather. The atmosphere has four layers. Atmosphere: The layers Based on tempe
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Chapter 2 - Water:It is blue gold!

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                                   Water:It is blue gold! Water is a precious resource! Water has two qualities that make it a precious natural resource.First, water is absolutely necessary for life.Human beings,animals and plants cannot survive without water. Your body is about 65 per cent water. You can live without food for thirty days or even for a few days. When the water content in your body drops just by 1 per cent, you feel thirsty. If it drops by 10 percent, there is a danger of death. water has two unique qualities: It is essential for life and it cannot normally be replaced by another resource. We have many needs for water! Human beings need water for personal use, agriculture and industries. At home, water is necessary for drinking, cooking food, washing, cleaning, toilet use, and gardening. Nature  gives us fresh water every year! Water cycle- The water cycle gives us two great benefits.First, we get this supply of water every year.
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