6th grade chpt 3 Weathering and Soil Formation

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Across
  1. 3. soil ___ depends upon the size of the grains of the soil particles
  2. 5. some plants produce____ from their roots that help weather materials they are growing around
  3. 7. an acid has a pH ___ seven
  4. 9. this type of weathering breaks down materials through chemical processes
  5. 11. this soil type does NOT allow water to flow through it very well
  6. 13. this layer of soil is at the base of all the others
  7. 14. anything in the environment that humans can use that is naturally available
  8. 18. tilling in the dead plants from the last crop to help retain nutrients and moisture for the soil
  9. 21. cutting into a hill or mountain to create flat areas for planting
  10. 22. the process of carrying away things that have been weathered
  11. 23. this term means water can flow through the soil easily because it has many spaces between the grains
  12. 25. the ___ of an area can increase or decrease the weathering rate of materials
  13. 27. to test how __ something is, you can use pH indicator papers
  14. 31. soil ___ is a measure of how good the soil is for growing plants
  15. 32. a base has a pH ____ seven
  16. 33. this layer of soil is the most nutrient rich
  17. 34. soil that is rich in decaying plant and animal matter, it is dark in color
  18. 35. too much or too little ____ is not good for the soil
  19. 37. another name for horizon A
  20. 38. this process occurs when oxygen in the air reacts with materials to break them down chemically
Down
  1. 1. water has a pH of ___
  2. 2. breaking down of materials through mechanical or chemical processes
  3. 4. plowing along a curve on a hill instead of straight lines, helps prevent soil erosion
  4. 6. this is produced when chemicals in the air mix with rain
  5. 8. this type of weathering breaks down materials by using force
  6. 10. to ___ an acid, you can add a base to the solution, or vice cersa
  7. 12. horizon B forms when rainwater ___ nutrients and heavy materials down below it
  8. 15. the principle of ___ states that the processes that are occurring on Earth today to change the face of the planet, are the same ones that have happened in the past
  9. 16. organisms that live in the soil help to ___ it
  10. 17. humus forms from the process of ____, which breaks the dead matter down
  11. 19. mechanical weathering where things are worn away due to rubbing or pushing against something else
  12. 20. this is the fraction of available land for farming on the planet
  13. 24. soil that is made of some clay, some sand, and some silt, it is suitable for plant growth
  14. 26. the ___ of rock being weathered can increase or decrease the weathering rate of materials
  15. 28. when water freezes in a crack in a rock, expands and breaks apart the rock
  16. 29. planting different crops in a field each season to keep nutrients in the soil
  17. 30. the order that soil horizons form after bedrock weathers and breaks down
  18. 36. another name for horizon B