Soil texture and structure

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Across
  1. 4. the metamorphic form of limestone
  2. 5. the largest soil particles
  3. 7. the compressing of a soil which excludes air
  4. 9. a soil structure associated with compaction
  5. 10. young rocks formed in lakes and seas
  6. 11. a soil aggregate
  7. 12. clay particles binding together
  8. 15. the settling out of silt particles
  9. 17. decomposed organic matter
  10. 18. an electrical charge carried by a soil particle
Down
  1. 1. the layer below the topsoil
  2. 2. a kind of igneous rock
  3. 3. a soil containing sand silt and clay particles
  4. 6. a good topsoil structure
  5. 7. the physical working of soil to improve it
  6. 8. a kind of limestone
  7. 9. air spaces in soil
  8. 13. the washing out of nutrients from a soil
  9. 14. very old rocks formed deep beneath the earth's crust
  10. 16. part of soil weathering