Chapter15 - Chapter 15 The Geography of Soils The Biosphere...

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Chapter 15 The Geography of Soils The Biosphere Earth home of only known biosphere in solar system – supports life Plants are critical link between life and solar energy Energy enters biosphere via photosynthesis Soil is essential link between lithosphere and plants – helps sustain life Earth’s Four Spheres Atmosphere Hydrosphere Lithosphere Biosphere The Geography of Soils Chapter 15: pages 459-460, 462-472 only Soil horizons, p. 459 Soil texture, p. 460 Soil acidity and alkalinity, p. 462 Soil formation factors and management, p. 463 Soil classification, pp. 463-472: mollisols, alfisols, oxisols, ultisols Soil Contains both minerals (from decomposing regolith) and organic matter (from decomposing plant material) Soil has several layers, termed horizons Soil Horizons A horizon close to surface, usually darker due to presence of organic materials C horizon is weathered bedrock Soil Texture Size and organization of particles From fine to course: clays Æ silts Æ sands Æ pebbles
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Chapter15 - Chapter 15 The Geography of Soils The Biosphere...

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