Chapter 2 crossword puzzle

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Across
  1. 6. a measure of how well soil supports plant growth
  2. 7. process that splits rock when water seeps into cracks, then freezes and expands
  3. 8. the soil layer of rock beneath the soil
  4. 11. soil organism that breaks down the remains of organisms and digests them
  5. 12. lines on topographic maps that connect the points of equal elevation
  6. 14. the process that breakes down rocks through chemical changes
  7. 15. mixture of humus, clay, and other minerals that form the crumbly, topmost layer of soil
  8. 16. anything in the environment that humus use
  9. 17. a thick mass of grass roots and soil
  10. 18. the diffrance of elevation from one contour line to another contour line
  11. 19. soil conservation method in which dead stalks from the previous years crops are left in the ground to hold the soil in place
  12. 22. the physical and chemical processes that break down rock at Earth's surface
  13. 23. a map that shows the diffrance in features of an area
  14. 24. the layer of soil beneath the topsoil that contains only mostly clay and other minerals
  15. 25. the geological term that the same geological processes that operate today operated in the pastto change Earth's surface
  16. 27. the layer of soil that differce in color and texture from the layers above and below
Down
  1. 1. when water, ice, wind, or gravity moves weathered rock and soil
  2. 2. the grinding away of rock by other rock particles carried in water, ice, or wind
  3. 3. the loose layer of dead plant leave sand stems on the surface of soil
  4. 4. characteristic of material that is full of small, connected air spaces that watercan seep through
  5. 5. a heavier contour line on a topographic map that is labeled with elevation of that counter line in round units
  6. 9. the loose weathered material on Earth's surface in which plants can grow
  7. 10. plowing fields along the curves of a slope to prevent soil loss
  8. 11. the area of the Great Plains where wind erosion caused soil loss during the 1930's
  9. 13. the type of weathering in which is physically broken into smaller pieces
  10. 20. a chemical change in witch a substance combines with oxygen, as when iron oxidizes, forming rust
  11. 21. the management of soil to prevent its destruction
  12. 26. rich fertile soil that is made up of about equal parts of clay, sand, and silt.
  13. 28. dark colored organic material in soil