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Soil Horizons 1

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

 1. 

Decayed organic material turns into a dark colored material called ___________.
a.
litter
c.
humus
b.
clay
d.
soil
 

 2. 

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

 3. 

Each layer of a soil profile is called a __________.
a.
horizon
c.
humus
b.
horizontal
d.
litter
 

 4. 

mc004-1.jpg
Which of these layers would contain the most humus?
a.
A
c.
C
b.
B
d.
all have the same amount
 

 5. 

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

 6. 

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

 7. 

The rock and mineral fragments in soil come from rock that has been ____.
a.
blasted
c.
weathered
b.
carved
d.
chemically treated
 

 8. 

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
 

 9. 

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

 10. 

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

 11. 

mc011-1.jpg     
In which horizon of a soil profile does leaching normally occur?
a.
A
c.
C
b.
B
d.
neither of these
 

 12. 

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



 
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