1. What is humus?
2. What element is humus rich in?
3. Why are weathering and erosion important to soil formation?
4. What is probably the most important ingredient in humus?
5. What effect do plant roots have on rock?
6. At what rate do weathering and erosion occur?
7. How would you compare young soil to soil that is much older?
8. Why is topsoil darker than the other layers of soil?
9. What is leaching and why is it important?
10. What is bedrock?