Across
- 3. the top layer of soil that contains humus
- 5. layer of rock beneath the soil
- 10. the size, shape, and position of the particles of soil
- 12. the process of wearing something down by friction
- 14. the ability to let water pass through
- 15. weathering the breakdown of rock into smaller pieces of the same material without any change to its composition
- 16. a chemical reaction in which an element combines with oxygen to form an oxide; iron oxide = rust
- 17. the process by which rainwater dissolves and carries away minerals and nutrients in topsoil
- 18. the process in which sediment is picked up and moved from one place to another
Down
- 1. the amount of open space between an object
- 2. weathering breakdown or decomposition of rock that takes place when minerals change through chemical processes
- 4. the decaying organic matter in soil
- 6. the process in which layers or sheets of rock gradually break off
- 7. the process by which natural forces break down rocks and soil
- 8. the expansion of desert conditions in an area where the natural plant cover has been destroyed
- 9. horizon a soil layer with physical and chemical properties that differ from those of the soil layers above or below it
- 11. the makeup of rock or soil describing the minerals or elements present in it
- 13. the process in which transported sediment is laid down