28 SOIL COMPOSITION, CLASSES AND TYPES 



13. What is meant by the mechanical composition of a soil? 



14. Distinguish between "light" and "heavy" soils. 



15. What are residual soils? Is peat one of them? 



16. Name and describe the transported soils. 



17. Tell the story of the glaciers. 



18. What is peat? Describe its formation. What is "raw" peat? What 



is muck? 



19. Can we have soils that may be described as residual alluvial soil; stony 



loess; glacial sandy loam; or cumulose silt loam? Explain. 



20. What is soil mapping? 



21. How may a loam differ from another loam? How may the two be dis- 



tinguished from each other? 



22. What is a soil type? Illustrate. 



23. How may soil types be classified or grouped? 



24. What is meant by a soil series? 



25. Are peat and muck soils to be regarded as classes or types of soil? Dis- 



tinguish clearly between peat and muck. What is meadow? 



26. Describe the conditions which lead to the formation of a "marsh" or 



"swamp" soil which you have seen. 



27. For an outline summary of the chapter see table of contents. 



