Chapter two vocabulary

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Across
  1. 2. a soil layer that differed from the other layers above and below it
  2. 6. when water seeps into cracks, freezes, and expands the crack
  3. 7. conserving soil by plowing fields along the curves of a slope
  4. 8. in the 1930's an area in the Great Plains where there was a wind cause a huge soil loss
  5. 9. the difference in elevation between the contour lines
  6. 11. type of weathering where rock is physically broken into rock particles
  7. 15. a material that is organic and dark-colored and can be found in soil
  8. 18. a large layer of grass roots and soil
  9. 19. weathered material that plants can grow in
  10. 22. a geological principle that operated in the past and still operates today
  11. 25. rich soil that has equal amounts of clay, sand, and silt
  12. 26. a layer of dead plants on the surface of the soil
  13. 27. the process of conserving soil
  14. 28. a characteristic of a material that has tiny connected air holes that water can seep through
  15. 29. the process that wears away rock on Earth's surface
Down
  1. 1. the process of conserving soil by leaving last years stalks in the soil to decompose
  2. 3. the darker line on a topographic map that shows round units of elevation
  3. 4. a mixture of humus,clay, and other materials that make up the top layer of soil
  4. 5. the layer beneath that soil that is solid rock
  5. 8. an organism the decomposes dead organisms
  6. 10. type of weathering that breaks down rocks though a chemical process
  7. 12. when forces of nature carry away weathered rock
  8. 13. when one rock grinds against another and the particles sure carried away by water,ice,or wind
  9. 14. a resource that can be found in nature
  10. 16. the measure of how well soil can provide plant growth
  11. 17. the layer of soil below the topsoil
  12. 20. a map the shows land features from above.
  13. 21. a line on a contour map that shows elevation
  14. 23. when a substance combines with oxygen and forms a chemical change
  15. 24. keeping the soil fertile by planting a different crop each year