Checks

Digging with the moles

1. QWhat are the organic and the inorganic components of the soil?
2. Why is the soil so important for the life of organisms?
3. What are the main causes of deterioration of the soil?
4. What are the uses of each type of soil?
5. What factors dictate the composition and final structure of the soil?
6. How is the soil generated?
7. How does the climate affect the formation of the soil?
8. What is leaching?
9. What is evaporation?
10. What promotes the chemical and biological activity of the soil?
11. What is the effect of ice on the soil?
12. What is the main activity based on the exploitation of renewable resources and what products can be obtained from it?
13. What are chemical fertilisers and phytosanitary products, and what are they for?
14. What is the proportion of soil surface with salinity problems?
15. What is sewage and how is it related with soil pollution?
16. What does salinisation mean?
17. Describe the percolation process.
18. What is soil permeability?
19. What causes an excessively acidic soil?
20. What crops are most sensitive to acidity?
21. Why are heavy metals harmful for man and what effect can they have on the soil?
22. What is being done to keep the amounts of heavy metals contained in the soil below a given safety threshold?
23. What other factors cause an excessively acidic soil and how do they contribute to environmental pollution?
24. What are the causes of desertification?
25. What are the driest geographical areas?
26. How can man’s behaviour affect the desertification process?
27. What factors is erosion caused by?
28. Why is soil reclaimed?
29. What is sustainable farming?