Across
- 3. organisms that break the remains of dead organisms down
- 4. the leaves that plants have shed on top of the top soil
- 6. dark colored substance that forms as plants and animals decay
- 8. crumbly dark brown soil is a mixture of humus, clay, and minerals
- 10. grinding away of rock by other rock particles
- 11. iron combines with oxygen and water to form rust
- 12. farmers disturb the soil as little as possible
- 14. b horizon and consists of clay and other particles washed down
- 18. rock is broken down by chemical changes
- 20. where farmers plow their fields along the curves of a slpoe
Down
- 1. layer of soil that differs in color and texture from other layers
- 2. farmer plants a different crop in a field each year
- 5. the removal of rock by wind, water, and ice
- 7. when rock is physically broken down
- 9. material is full of tiny air spaces that let water seep
- 13. measure of how well the soil supports plant growth
- 15. the loose,weathered material on Earth's surface plants grow here
- 16. solid layer of rock beneath the soil
- 17. process that breaks down rock with heat, cold, or water
- 19. soil that is made of equal parts of clay, sand, and silt