Sustainable Soil - can you solve the clues?

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