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