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Soil Quiz

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Soil is a mixture of weathered rock, mineral fragments, water, air and ____.
a.
sand
c.
moss
b.
decayed organic matter
d.
clay
 

 2. 

The layer of soil that contains the most organic material is called the ____ horizon.
a.
A
c.
C
b.
B
d.
D
 

 3. 

Litter often covers the ____ horizon.
a.
A
c.
C
b.
B
d.
all of the above
 

 4. 

Soil erosion can be slowed by ____.
a.
no-till farming
c.
plowing at least three times a year
b.
cutting trees from the middle of fields
d.
farming on steeper slopes
 

 5. 

The organic matter in humus is made of ____.
a.
dead worms
c.
roots
b.
stems
d.
all of the above
 

 6. 

On steep slopes and mountains, ____ helps reduce erosion by creating level areas for crops.
a.
a shelter belt
c.
mulching
b.
strip cropping
d.
terracing
 

 7. 

Soils in ____ contain little organic material and are thin.
a.
tropical areas
c.
prairies
b.
deserts
d.
temperate forests
 

 8. 

Plants cannot grow without ____.
a.
rocks
c.
moss
b.
soil
d.
pesticides
 

 9. 

____ regions are especially vulnerable to erosion because their soils are useful to farmers for only a few years before their nutrients are gone.
a.
Desert
c.
Mountain
b.
Tropical
d.
Prairie
 

 10. 

The mass of clay, silt, sand, and boulders that covers much of the United States was deposited by ____.
a.
farming
c.
ice wedging
b.
glaciers
d.
huge bulldozers
 

 11. 

Minerals found in the B horizon were dissolved in water and carried there by a process called ____.
a.
oxidation
c.
weathering
b.
leaching
d.
littering
 

 12. 

In bottomlands where water is plentiful, soil is often ____.
a.
thin
c.
thick
b.
rocky
d.
light
 

 13. 

The B horizon is ____.
a.
rockier than the C horizon
c.
lighter than the A horizon
b.
richer in humus than the A horizon
d.
thinner than the C horizon
 

 14. 

Plants don't grow as well when ____ has been lost.
a.
clay
c.
parent rock
b.
topsoil
d.
slope
 

 15. 

____ is a factor that affects soil development.
a.
Time
c.
Type of rock
b.
Slope
d.
all of the above
 

 16. 

The ____ horizon has smaller rock and mineral particles than the other layers.
a.
A
c.
C
b.
B
d.
D
 

 17. 

Below the C horizon is ____.
a.
topsoil
c.
clay
b.
rock
d.
humus
 

 18. 

____ turns and loosens soil, improving it for crops, but leaving soil vulnerable to erosion.
a.
Grazing
c.
Plowing
b.
No-tilling farming
d.
Terracing
 

 19. 

Soil erosion occurs ____.
a.
where animals eat away all the plants
c.
on steep slopes
b.
when forests are removed
d.
all of the above
 

 20. 

When farmers leave plant stalks in the field to reduce soil erosion, it is called ____.
a.
contour farming
c.
no-till farming
b.
plowing
d.
terracing
 



 
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