1. Class 13b: Soils (pedology)

2. What is soil? Not just dirt

3. Soil components Parent material: Temperature and moisture

4. Soil formation Bedrock breaks apart into regolith

5. Classifying soils: color Color tells you about chemistry

6. Classifying soils: texture Size, organization of particles

7. Classifying soils: texture

8. Classifying soils: structure Arrangement of soil particles

9. Classifying soils: structure Porosity: Permeability:

10. Soil moisture

11. Soil-water balance Warmer temperatures: higher ET Higher precipitation: higher percolation

12. Soil profiles

13. Soil classification More complicated than climate

14. Entisols Relativey new: most recent soils

15. Oxisols Old soils; minerals except oxides leached out

16. Aridisols Found in arid environments

17. Mollisols Most productive soil

18. Alfisols Significant aluminum (Al) and iron (Fe)

19. Spodosols Most acidic soil; minerals leached to lower horizon

20. Soil degradation Forms in 500 years, but can disappear in one

21. Soil degradation

22. Salinization: salty soil