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UCM BIOL 1005 - Soil PPT

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BIOL 1005 1st Edition Lecture 14 Outline of Last Lecture I. Land Use II. The Need for PlanningIII. Land UseIV. Cities Grew in SizeV. Land UseVI. Migration from Central City to the SuburbsVII. Problems Associated with Unplanned GrowthVIII. WetlandsIX. Special Urban PlanningX. Urban Recreation PlanningXI. Recreation UsesXII. Redevelopment of Inner City AreasXIII. Multiple Land UseOutline of Current Lecture I. WeatheringII. Soil FormationIII. Other Factors Influencing Soil FormationIV. Soil PropertiesV. Soil ProfileVI. Soil HorizonsVII. VideoCurrent LectureI. Weathering Weathering—Fragmentation or chemical change of parent material. Mechanical —Results from physical forces reducing size of rock particles. Chemical—Rock fragments exposed to atmosphere may oxidize, or otherwise chemically change.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Biological - II. Soil Formation Parent material—Ancient layers of rock, or more recent deposits from lava flows or glacial activity.III. Other Factors Influencing Soil Formation Position on slope Climate Time Rainfall Soil pH ***On a worldwide average, it takes about 15 years to form 1centimeter of soil.IV. Soil Properties Texture—Determined by the size of mineral particles within the soil. Structure—Refers to the way various soil particles clump together. Friable—Crumbles easily.V. Soil Profile Soil Profile—A series of horizontal layers of different chemical composition, physical properties, particle size, and amount of organic matter. Horizon—Each recognizable layer of the profile.VI. Soil Horizons O Horizon— (Litter) A Horizon—(Topsoil) contains most of the soil nutrients and organic matter. B Horizon—(Subsoil) less organic matter and fewer organisms, but accumulates nutrients leached from topsoil.—Poorly developed in dry areas. C Horizon—Weathered parent material, very little organic material. R Horizon— Parent material - Bedrock.VII. Video- World Agriculture and Population- Cal (CA) POLYo Increased arable land, advanced machinery, and improved crop variety lead to increased food productiono War, disease, birth control, pests, and loss of nutrients/soil capability to produce limits populationo Increased water helps plant growth as well as increased use of supplemental nutrients and alternative energieso Maintain soils capability to grow


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