Chapter 2

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Across
  1. 5. the process that breaks down rocks through chemical changes
  2. 7. operated in the past to change the Earths surface
  3. 10. a line on a topographic map that connects points of equal Evevation
  4. 11. a loose weathered material on earths surface in which plants can grow
  5. 12. the difference in elevation from one contour line to the next
  6. 13. the layer of soil that differs in color and texture from the layers above it and below it
  7. 14. a chemical change in which a substance combines with oxygen, as well iron oxidates, forming rust
  8. 15. soil organisms that break down the remains of organisms and digest them
  9. 16. the solid layer beneath the soil
  10. 17. the process by which water,Ice,wind, or gravity moves weathered rock and soil
  11. 19. soil conversation method in which dead stalks from the previous years crop are left in the ground to hold the soil in place
  12. 24. anything in the environment that humans use
  13. 25. the grinding away of rock by other rock particles carried in water,ice, or wind
  14. 27. a map that shows surface features of an area
  15. 29. mixture of humus,clay,and other minerals that forms the crumbly, topmost layer of soil
Down
  1. 1. a heavier line that is labeled with the elevation of that contour line in round units
  2. 2. the chemical and physical processes that break down rock at earths surface
  3. 3. a measure of how much soil supports plant growth
  4. 4. the type of weathering in which rock is physically broken into smaller pieces
  5. 5. the planting of different crops in a field each year to maintain the soils fertitly
  6. 6. dark colored organic material that's in the soil
  7. 8. process that splits rock when water seeps into cracks, then freezes and expands
  8. 9. the loose layer of dead plant leaves and stems on the surface of the soil
  9. 18. the magenament of soil to prevent its destruction
  10. 20. a thick mass of grass roots and soil
  11. 21. the layer of soil beneath the topsoil that contains mostly clay and other minerals
  12. 22. plowing fields along the curves of a slope to prevent soil loss
  13. 23. the area of the Great Plains where wind erosion cause soil loss during the 1930's
  14. 26. rich,fertile soil that is made up of about equal parts of clay, sand and silt
  15. 28. characteristic of a material that is full of tiny, connected air spaces that water can seep through