5.1 Soil
5.1.2—Soil composition
5.1.3—Soil profiles and horizons
5.1.4—Soil system inputs
5.1.5—Soil system outputs
5.1.6—Soil transfers
5.1.7—Soil transformations
5.1.8—Soil flow diagrams
5.1.9—Soil foundation role
5.1.10—Soil and biodiversity
5.1.11—Soil in element recycling
5.1.12—Soil texture
5.1.13—Texture affects productivity
5.1.14—Soil carbon role
5.1.15 (HL)—Soil classification
5.1.16 (HL)—Soil horizons
5.1.17 (HL)—A horizon (topsoil)
5.1.18 (HL)—Soil formation factors
5.1.19 (HL)—Sand, silt, clay differences
5.1.20 (HL)—Soil property analysis
5.1.21 (HL)—Carbon release from soils
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