292 SOIL EROSION 



Field Study. — Observe injuiy due to soil by erosion. Suggest prevention 

 in particular cases. 



Projects in reclaiming eroded land should be conducted. These may 

 include any or all of the methods suggested in the study of this chapter. 



Other projects in preventing erosion should include terracmg, grassing, etc. 



QUESTIONS 



1. To what extent is soil erosion a serious problem? 



2. Discuss the injuries resulting from soil erosion, 



3. Under natural conditions how is soil washing checked or prevented? 



4. Explain why the streams from virgin forests are clear and steady. 



5. What marks the begmning of excessive erosion in this country? 



6. Discuss the clearing of steep slopes in relation to soil erosion. 



7. Discuss the results of destructive lumbering and overgrazing. 



8. Distinguish between gully and sheet erosion. 



9. "^^Hiat are landshdes? What causes them? 



10. Describe river-bottom erosion. 



11. Upon what depends, in a large measure, the prevention and control of 



soil erosion? Name other factors involved. 



12. Discuss drainage and soil organic matter in relation to the control of 



erosion in farming. 



13. What constitutes proper tillage and cropping on slopes subject to washing? 



14. What is terracing as appHed to soil management? 



15. What are the two unportant methods of terracing? Describe each, 



16. Mention some ways in which gullying may be stopped and eroded 



lands reclaimed. 



17. What examples have you seen? 



