The document discusses various types of weathering processes that break down rock into soil, including mechanical weathering processes like frost wedging, unloading, and thermal expansion. It also discusses chemical weathering processes like dissolution, oxidation, and acid mine drainage. Additionally, it covers topics related to soil formation, such as the regolith, humus, parent material, soil profiles, eluviation and leaching, and soil taxonomy.

1. Weathering and soil Weathering and soil Earth’s external processes - weathering Mechanical frost wedging unloading thermal expansion root wedging Chemical dissolution oxidation hydrolysis

3. Mechanical weathering – frost wedging Weathering and soil

4. Mechanical weathering – frost wedging Weathering and soil

5. Mechanical weathering – talus slopes Weathering and soil

10. Mechanical weathering – unloading (sheeting) Weathering and soil

11. Mechanical weathering – unloading (exfoliation domes) Weathering and soil

12. Mechanical weathering – unloading (exfoliation domes) Weathering and soil

13. Mechanical weathering – thermal expansion Weathering and soil

14. Root wedging

17. Chemical weathering – dissolution Weathering and soil

18. Chemical weathering – dissolution Weathering and soil

20. Chemical weathering – oxidation Weathering and soil

21. Chemical weathering – acid mine drainage Weathering and soil

22. Chemical weathering – spheroidal weathering Weathering and soil

24. Rates of weathering – differential weathering Weathering and soil

26. Soil – regolith (mass of uncompacted sediments) Weathering and soil

27. Soil - humus Weathering and soil

28. Soil – formation and composition Weathering and soil

29. Soil – formation and composition Weathering and soil

30. Soil – parent material Weathering and soil

31. Soil – parent material (residual soil) Weathering and soil

32. Soil – soil profile The E horizon is inserted here.

33. Soil – eluviation and leaching Weathering and soil C and R may be treated as one layer (Known as Bedrock). The E horizon is inserted here.

34. Soil – soil taxonomy Weathering and soil