Across
- 2. soil organisms that break down dead plants and animals
- 9. a process that breaks down rock
- 11. process that breaks rocks through chemical change
- 15. plowing fields with a slope to prevent soil loss
- 17. mass of roots grass and soil
- 18. process that splits up rock into small cracks
- 19. the layer beneath the top soil that has clay
- 20. organic material in soil
- 22. a weather when rock is physically broken
- 25. a chemical change that forms rust
- 27. rich soil that has equal parts of silt clay and sand
- 28. a difference of something from one contour line to another
- 29. the grinding away of rock from other rocks
- 30. weathered material where plants can grow
Down
- 1. the dead plants on the soils surface
- 3. the way to prevent soil destruction
- 4. soil that is different through color and texture
- 5. keeping a soils fertility by planting different crops each year
- 6. tiny air spaces that water can seep through in material
- 7. dead crops left in the ground to hold a place in the soil
- 8. the loss of soil in the Great Plains around the 1930's
- 10. things humans use in nature
- 12. a heavier contour line on a map
- 13. the process when things move weathered rock and soil
- 14. mixture of minerals that makes up the topmost layer of soil
- 16. a line that connects 2 separate points on a map
- 21. was operated in the past to change earths surface
- 23. a map that shows a type of area
- 24. how we'll soil supports plant growth
- 26. solid rock beneath the soil