Soil

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