Earth Space Chapter 9 Review

1. dark, organic material that remains when organisms decay
4. the rapid movement of a large amount of mud
7. constructing steplike ridges that follow the contours of a hill, preventing water from flowing downhill
11. the removal of topsoil by continuous rainfall or wind in dry periods
14. mechanical weathering due to the grinding against other rocks or sand particles
15. chemical weathering due to a metallic element reacting with oxygen
21. a large mass of loose rock and soil falling down a slope
23. soil with particles too small to see or feel
26. chemical weathering due to a compound converting to CO3
27. a type of weathering done by physical means
30. planting two crops in alternating rows

2. a large block of soil or rock that slides downhill as a single piece
3. a rock falling from a cliff or mountain
5. chemical weathering due to pollution causing high pH levels in rainfall
6. weathering at different rates due to the different properties of rocks
8. solid, unweathered rock
9. chemical weathering due to organisms producing weak acids
10. mechanical weathering due to the physical action of living organisms
12. the physical or chemical decomposition of rock material
13. soil with particles that can be both seen and felt
16. mechanical weathering due to the repeated freezing and thawing of rock
17. plowing pattern that follows the curves of the land
18. the slow flow of wet soil sliding over frozen subsoil
19. the improper plowing of furrows causing soil to easily wash away
20. planting different types of crops in a field each year
22. chemical weathering due to water and another substance combining to make 2+ new substances
24. a layer or weathered rock fragments
25. a type of weathering done by chemical reaction
28. the slowest form of soil movement; moves the most soil overall
29. a loose mixture of rock fragments and organic material that can support growth of vegitation
30. soil with particles that can be felt, but not seen