Across
- 3. smallest size particles.
- 7. biome with deep O horizons due to leaf litter.
- 10. smallest particle size.
- 11. topsoil. Organic matter mixed with weathered rock particles.
- 14. loosens and mixes soil, increasing water percolation and mixing O-horizons due to leaf litter.
- 15. caused wheat prices to fall to record low levels.
- 17. molecular nature of rock is changed due to reactions with water, oxygen, etc.
- 19. biome with very shallow O and A horizons due to their low productivity.
- 20. intermediate size particles.
Down
- 1. the slow movement and filtering of a liquid through a porous material.
- 2. subsoil. Tiny rock particles that leach down from topsoil.
- 4. solid rock underlying loose deposits such as soil or alluvium.
- 5. the physical breakdown of rock by wind, water, and heat.
- 6. biome with very shallow horizons due to their low productivity.
- 8. parent material that has undergone little weathering because it is so deep underground.
- 9. biome with acidic soils due to the needles they drop.
- 12. bedrock. Unweathered,solid rock.
- 13. massive drought that began in the winter of 1931-1932 and persisted for up to 7 years.
- 16. humus. Non-decomposed plant matter.
- 18. partially decomposed plant and animal matter.