Across
- 5. Anything in the environment that humans use
- 8. A soil organism that breaks down the remains of organisms and digests them
- 9. Method which dead stalks from the previous years crops are left in the ground to hold soil in place
- 13. Principle that states that earth surface changed the same way forever
- 16. Chemical change when when a substance combines with oxygen
- 18. Layer of soil beneath the topsoil, contains clay and other minerals
- 19. measure of how well soil supports plant growth
- 20. type of soil that is made up of about equal parts of clay, sand, and silt
- 23. A map that shows Suface area
- 24. rocks broken down chemically
- 26. A material that is full of tiny connected air spaces that water can seep through
- 27. The crumbly, topmost layer of soil, mixture of humus, clay, and other minerals
- 28. When water, ice, wind, or gravity moves weathered rock or soil
Down
- 1. Dark colored organic material in soil
- 2. plowing fields along curves of slopes to prevent soil loss
- 3. Solid layer of rock beneath the soil
- 4. The distance in elevation from Contour line to Contour line
- 6. Loose layer and dead plant leaves and stems on the Suface of the soil
- 7. rocks broken down physically
- 10. Grinding away of rock by other rock particles carried in ice, water,or wind
- 11. Rocks that break down on Earths Suface physically and chemically
- 12. area of the Great Plains where wind erosion caused soil loss in the 1930s
- 14. Darker contour line on a topographic map that rounds elevation units
- 15. thick mass of grass roots and soil
- 17. Line that connects points with the same elevation on a topographic map
- 21. Planting of different crops in fields each year to maintain soils fertility
- 22. management of soil to prevent destruction
- 25. The process when water seeps into cracks, freezes and expands
- 29. Horizon Layer of soil that differs in color and texture