Across
- 3. process by which soil is moved
- 5. passing water removes substances
- 6. splitting of rock when water seeps in
- 9. an organism that breaks down dead organism
- 11. breaking down of rock through a chemical change
- 12. the past and present processes are the same
- 16. layer of soil under the topsoil
- 17. upper layer of soil
Down
- 1. dark,organic material
- 2. rock is physically broken into smaller pieces
- 4. break down rock at earths surfaces
- 7. a thick mass of grass, roots and soil
- 8. layer of rock underground
- 10. material that water can go through
- 13. chemical change in which a substance combines with oxygen forming rust
- 14. grinding away of rocks
- 15. layers of different colors of soil
- 16. loose material where plants grow
- 18. loose layer of dead plant leaves and stems on the surface of the soil