Ch 15 Study Guide SoilsName_________________________ Date_______ Vocabulary Parent material- rock from which soil forms Weathering- breaking rock down by biological‚ physical and chemical processes Topography-surface features of the land Humus- decomposed organic matter Leaches- movement of water and dissolved chemicals through the ground Illuviation- deposition of leached minerals in the lower layers of the soil Soil Profile- vertical section of soil showing the soil horizons O-Horizon-
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include the right temperature‚ amounts of water‚ season‚ surrounding air‚ amount of sunlight‚ and soil conditions. In addition‚ a fungus known as mycorrhizae will develop within the roots of this plant and eventually undergo symbioses. Fortunately‚ these mycorrhizal fungi form mutualistic relationships; which will enable the plant to absorb a sufficient amount of water‚ consume nutrients from the soil‚ and prevent pathogens from harming the roots. An experiment on the germination and seed production
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the farming villages very small so they cannot afford the equipment and advanced materials used in America today. (Sanchez‚ 2). They don’t have fertilizer to restore the soil. Once the nutrients are gone it becomes very difficult to grow anything. (Sanchez‚ 2). Dave Penny says it is because of the “unskilled farmers” that the soil has gotten to be so bad. Along with these causes are overpopulation and over consumption. (Aaseng‚ 37-38). It’s bad enough not having enough food in the first place but
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Soil erosion and management on the Loess Plateau 作者： 作者单位： 刊名： 英文刊名： 年，卷(期)： 被引用次数： CAI Qiang-guo Institute of Geographic Sciences and Natural Resources Research‚ CAS‚ 地理学报(英文版) JOURNAL OF GEOGRAPHICAL SCIENCES 2001‚11(1) 6次 参考文献(23条) 1.Chen Yongzong;Jing Ke;Cai Qiangguo Modern Erosion and Management 1988 2.Lal R Soil erosion by wind and water: problems and proposals 1988 3.Shi Nianhai Loess Plateau and evolution of its agro-forest distribution area 1981 4.Zhu Kezhen Preliminary study of climate
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the world due to salinity‚ as when the salt gets on to the top of the soil.....it causes disaster to the plants and trees. Salt comes in many forms in the natural environment—calcium‚ magnesium‚ carbonate‚ sodium chloride‚ bicarbonate‚ and sulphate. Many landscapes are naturally saline‚ but secondary salinity isn’t so natural‚ occurring when salts from deep within the earth are dissolved and deposited into soil and water as a result of human activity. This can happen in one of two
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Introduction Deforestation is the process of clearing the forest by cutting down the trees for fulfilling different demands. Forest has a vital role in meeting people’s needs. Therefore people usually cut down the trees of the forest without having proper knowledge. Indeed‚ exploit of land really lend a big helping to grow in economic. For example‚ exploit of land is for wider develop range‚ the lands is use to build households‚ buildings and as we know trees had a very high demand all across
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plantation means planting more trees in a planned way. It is very necessary to the environment. Trees are our best friends. They give us oxygen. They also give us shelter‚ shade‚ foods‚ fruits etc. They help our environment in many ways. They prevent soil erosion. They make our land fertile. They save us from droughts‚ floods‚ cyclones etc. If there are no trees our country will turn into desert. Different kinds of natural disasters will come. People will suffer from the shortage of food‚ shade and
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Adaptations of Savanna vegetation. Savanna vegetation must adapt to survive. Many problems must be overcome‚ such as lack of water‚ very seasonal rainfall‚ poor soil quality‚ grazing animals‚ very high temperatures and fire. 1. Define the following terms: Xerophytic = A plant adapted to living in a dry arid habitat; a desert plant Pyrophytic = plants adapted to tolerate fire Deciduous = Loss of leaves seasonally Perennial = lives more than 2 years Dormant = A condition of significantly
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which causes the color to change from black to gray. Oil‚ gas‚ and rain seep into the asphalt and hasten the development of cracks and potholes. Cracks are more than an eyesore. They allow rain to drain into the soil beneath the asphalt layer‚ and this causes the soil to shift. The shifting soil causes the cracks to get bigger‚ and it can even cause the underlying base of your driveway to become unstable. Having
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shortly after they are created. They usually breed pests and vectors which cause diseases to those living near an open dump. Open dumps are usually formed when making a foundation for a building. The waste of an open dump would decay and form part of the soil as organic manure. • Land Filling A landfill site (also known as tip‚ dump‚ rubbish dump or dumping ground and historically as a midden) is a site for the disposal of waste materials by burial and is the oldest form of waste treatment. Historically
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