Across
- 3. thin layer of weathered rock on the surface made up humus.
- 5. the process of farming by keeping the lines of contour on the sloppy regions.
- 7. is commonly called topsoil
Down
- 1. the protection of soil from erosion and other types of deterioration, so as to maintain soil fertility and productivity.
- 2. hard layer of rock beneath the soil
- 4. is commonly called weathered bedrock
- 6. is commonly called subsoil