06 -soils - Lecture 6: 28 January Landform Geography: Soils...

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1 Landform Geography: Soils (Ch. 12) Lecture 6: 28 January Lecture outline: 1. Introduction 2. Five soil forming factors 3. Soil Components 4. Soil Properties (*important for lab) 5. Soil Profiles 6. Soil Classification Make sure to review “Focus” section on p. 358: “Earthworms in the Soil” Next : The Structure of the Earth (p. 387-388) The Composition of Earth (p.389- 399) The Internal Processes (Ch. 14) Exam 1! (9 Feb) Introduction: Soil Uppermost layer of terrestrial Earth Considered renewable “resource” Average worldwide depth about 6 inches Partial reflection of parent material 1. Introduction Formation Physical and chemical disintegration of rocks weathering Regolith = blanket of rock is weathered and becomes soil (comprises parent material) Climate is important! 1. Introduction Figures 12-2 and 12-3 Five Soil Forming Factors 1. Geology 2. Climate 3. Topography 4. Biology 5. Time -- Longer time; higher potential for formation -- Geologic time scale 2. Five soil forming factors That is the state soil for SC!
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2 1. Geology If regolith turns into soil, isn’t the composition of regolith important? 2. Five soil forming factors Figure 12-2 2. Climate Formation accelerates with high temperature and moisture Soils deepest in warm, moist regions Soils more shallow in cool, dry regions Water transports chemicals 2. Five soil forming factors 3. Topography Figure 12.5 Slope and drainage influences soil depth: increase slope, decrease depth The organic portion makes soils (vs. dirt) Earthworms greatly benefit soil 2. Five soil forming factors 4. Biology Figure 12.9 - Tunnels facilitate drainage and aeration
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This note was uploaded on 02/17/2011 for the course GEOL 201 taught by Professor Baruah during the Spring '10 term at South Carolina.

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06 -soils - Lecture 6: 28 January Landform Geography: Soils...

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