Soil and it's important

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Across
  1. 2. farming practices adopted in hilly areas to stop erosion
  2. 5. The breakdown of rocks
  3. 7. the cutting down of trees
  4. 9. the removal of soil by water and wind
Down
  1. 1. mixture of dead plants and animals
  2. 3. planting more and more tree
  3. 4. other name for bedrock
  4. 6. mixture of sandy soil and clay soil
  5. 8. the most fertile layer of soil