physical and chemical properties of soils

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Across
  1. 4. scale, 0-14
  2. 6. K
  3. 7. Na
  4. 10. the composition of the soil
  5. 13. an element that helps the crops grow
  6. 14. does not hold water well at all
Down
  1. 1. the top layer
  2. 2. underneath the topsoil
  3. 3. , carbon-based matter
  4. 5. level 7 on the ph scale
  5. 8. is a solid, dust-like sediment
  6. 9. ph level lower then 7
  7. 11. rotten eggs
  8. 12. sticky when wet
  9. 15. ph greater then 7