Weathering, Soil, and Erosion

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

17
(No Transcript)