Across
- 1. layer of soil beneath topsoil
- 3. mass of grass roots and soil
- 5. line on topographic map that connects equal elevation
- 6. breaks down rock through chemical changes
- 8. a repeated process used from the past we use today
- 11. solid layer of rock beneath soil
- 13. plowing fields along curves
- 14. shows surface features of an area
- 15. dark colored material in soil
- 17. difference in elevation from one to another
- 19. measure of how good soil supports plant development
- 21. method where dead stocks help living stocks
- 23. loose layer of dead plants
- 24. process that breaks down Earth's rock
- 25. a heavier line than others
- 27. grinding away of other rock by other rock
- 28. substance combines with oxygen
- 29. characteristic that is made of material that is full of tiny air particles
Down
- 1. layer of soil that differs in color
- 2. water, ice, wind, or gravity moves wheathered rock and soil
- 4. rock is physically Brocken into smaller pieces
- 7. planting of crops each year to help its fertility
- 9. splits rock when water seeps into a crack
- 10. loose, wheathered material on Earth's surface
- 12. mixture of humus, clay, and other minerals
- 16. management of soil to stop damage
- 18. rich, fertile soil that is made up of sand, silt, and clay
- 20. soil organism that breaks down organisms and eats them
- 22. things in environment humans use
- 26. area of Great Plains where massive soil loss