Soil exploration

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Across
  1. 5. significant depth
  2. 6. core
  3. 7. trenches
  4. 8. area ratio
  5. 9. percussion
  6. 10. influence
  7. 12. core recovery
Down
  1. 1. direct
  2. 2. large structure
  3. 3. rotory boaring
  4. 4. disturbed sample
  5. 11. auger boring