Across
- 3. contour line that said the elevation
- 4. a chemical change that makes rust
- 6. difference of elevation from one contour line to the next
- 10. thick grass roots and soil
- 13. dead plants to help the soils fertility
- 15. dead plant leaves on the top of soil
- 16. material with spaces of air that water can go through
- 17. highest layer of soil with humus and clay mixed in it
- 18. breaks up remains of organisims and digest them
- 20. breaks rock by a chemical change
- 25. material with plants and animal matter
- 26. curves a hill to stop losing soil
- 27. plants can grow in this material
Down
- 1. water,wind,ice, or gravity move rock
- 2. process that works today that worked in past
- 5. wind erosion in the 1930's that lost soil
- 7. something that a person can use
- 8. rock is physically broke down into small peices
- 9. rich fertil soil made up of sand silt and clay
- 10. that changes color and texture
- 11. how soil helps plants grow
- 12. to stop soil destruction
- 14. a layer of rock under the soil
- 19. soil under topsoil with clay a And other minerals in it
- 20. brings together places of the same elevation
- 21. water goes into rock then it becomes ice then it expands
- 22. small rocks carried by wind or water or ice
- 23. a process with two ways to break down rock
- 24. show the land elevation