Maps & earths soil

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