Soil puzzle

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Across
  1. 2. Just visible to the naked eye
  2. 4. Proctective layer
  3. 6. Worm fungi bacteria
  4. 9. Broken down minerals and organic matter
  5. 10. Sand, clay and silt
  6. 12. Decomposed organic matter
Down
  1. 1. Small rock
  2. 3. Larger sized gravel
  3. 5. Organic matter
  4. 6. Decaying
  5. 7. smallest dirt particle
  6. 8. Small rock particles
  7. 11. first layer of soil