Sustainable Soil - Can you solve the clues?

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Across
  1. 3. overall physical condition of soil
  2. 4. found just below the school
  3. 6. main nutrient in soil and has an atomic symbol of N
  4. 7. of soil
  5. 11. nutrients to soil
  6. 12. to analyse the quality of soil
  7. 13. to dig up soil
Down
  1. 1. for a sustainable world
  2. 2. fertiliser made from food scraps and decomposed plant material
  3. 5. be determined by the number of cracks or pores in the soil
  4. 8. form in waterways when there are too many nutrients in soil
  5. 9. found in soil which shows that the soil is healthy
  6. 10. scientist test soil quality