1. Weathering, Soil, and Erosion
Ch. 7 & 8
Review Questions

2. The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is:
A. erosion
B. cracking and peeling
C. abrasion
D ice wedging

3. What kind of weathering causes the mineral composition of rocks to change?
A. mechanical
B. permeable
C. chemical
D. general

4. A hot and wet climate causes weathering to take place
A. slowly
B. at the same rate as when the limate is dry and cool
C. unevenly
D. rapid

5. Soil formation begins with the weathering of
A. litter
B. rock
C. the A horizon
D. humus

6. The mixture of rock particles, minerals, decayed organic material, air, and water is called:
A. gravel
B. litter
C. silt
D. soil

7. The decayed organic material in soil is called:
A. silt
B. litter
C. humus
D. clay

8. Which soil particle is the largest?
A. gravel
B. sand
C. silt
D. clay

9. Which soil particle is the smallest?
A. sand
B. gravel
C. clay
D. silt

10. The layer of soil in which topsoil is found is the
A. A horizon
B. B horizon
C. C horizon
D. bedrock

11. Most of the work of mixing humus within the soil is done by:
A. fungi
B. ants
C. earthworms
D. bacteria

12. The solid layer of rock beneath the soil is called:
A. bedrock
B. gravel
C. the B horizon
D. subsoil

13. The process by which natural forces move weathered rock and soil from one place to another is called
A. soil conservation
B. deposition
C. abrasion
D. erosion

14. The process in which sediment is laid down in a new location is called:
A. weathering
B. deposition
C. erosion
D. mass movement

15. Landslides, mudflows, slump, and creep are all examples of
A. mechanical weathering
B. runoff
C. mass movement
D. soil formation

16. Mass movement is caused by
A. plucking and abrasion
B. gravity
C. chemical weathering
D. erosion and deposition