Soil a valuable resource

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Across
  1. 1. Dark brown soil with large amount of humus
  2. 3. Perfect type of soil
  3. 7. Shows many distinct layers of soil
  4. 8. When slopes get unstable
  5. 9. Organic substance rich in nutrients
  6. 10. Excessive grazing
Down
  1. 2. Growing of forest trees where no forest were present
  2. 4. Soil low in nutrients
  3. 5. To preserve and protect
  4. 6. Good for cultivation