Maps & earths soil

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Across
  1. 2. they layer of soil that differs than the bottom or top soils
  2. 4. a topo map, a heavier contour line is labled with round units
  3. 7. a measure of how well soil supports plant growth
  4. 8. a map that shows surface features of an area
  5. 11. the chemical & pysical processes that break down rock on earths surface
  6. 13. the managment of soil to prevent its destruction
  7. 15. the process if either ice, water, wind or gravity moves rock or soil
  8. 17. a type of weather that rock is broken down into smaller pieces
  9. 19. when water seeps in a crack in a rock & freezes and expands
  10. 20. soil organasims that breaks down organisms & digest them
  11. 23. planting new in a feild each year to maintain soils fertility
  12. 27. the grinding away of rock by other rock particles carried in water or ice
  13. 28. the solid layer of rock beneath the surface
  14. 29. a line on a topo map that connects points of equal elevation
  15. 30. a mixture of humas, clay, that forms crumbly, topmost layer of soil
Down
  1. 1. plowing feilds along the curves of a slope so loss soil
  2. 3. bowl- the great plains, wind erosion of soil loss in the 1930's
  3. 5. a chemical change, a stubstance combines with oxygen, then forms rust
  4. 6. a thick mass of grass roots and soil
  5. 9. dark colored organic material in soil
  6. 10. when rock breaks down by chemical changes
  7. 12. soil conservation, dead stalks hold the soil in place
  8. 14. anything in a envirorment humans use
  9. 16. the geological prinsiple changes over time
  10. 18. the difference in elevation from one contour line to the next
  11. 21. a meterial full of tiny, connected air spaces water can seep through
  12. 22. loose, weathered material on earths surfuce in which plants can grow
  13. 24. the layer beneath the topsoil that makes up clay and other minerals
  14. 25. rich fertile soil that is made up of most equal parts of clay, sand, and silt
  15. 26. the loose layer of dead plant leave & stems on the surface of the soil