Weathering

2. material is full of tiny,connected air spaces that allow water to seep through it
5. type of weathering where rock is physically broken into smaller pieces
6. building block of soil
9. chemical and physical processes that break rocks
11. the loose, weathered material on Earth's surface in which plants grow
12. crumbly, dark brown soil that is mixture of humus, clay and other minerals
13. measure of how well the soil supports plant growth
15. rust
16. anything naturally occurring in the environment that humans use
18. plowing soil conservation method where dead stalks from previous year's crops in the ground until you plant again
20. movement of sediments by water,wind,ice or gravity
22. soil made of equal parts of sand, silt and clay
23. management of soil to prevent its destruction

1. process that splits rock when water seeps into cracks of rocks freezes and expands
3. the grinding away of rock by water, ice or gravity
4. horizon layer of soil that differs in color and texture from layers above and below it
7. type of weathering that breaks down rock through chemical changes
8. planting of different crops in a field each year to maintain soils fertility
10. processes that operate today operated the same in the past as well
14. dark-colored substance that form as plant and animal remains makes soils rich
17. plowing fields along the curves of a slope to prevent soil loss
19. soil organism that breaks down the remains of organisms and digests them
21. layer below topsoil that has less plant and animal matter