Section #: 7.3
Formation of Soil
Practice Test
1.
What soil horizon has high concentrations of organic matter and humus?
a.
horizon Z
b.
horizon B
c.
horizon A
d.
horizon C
2.
"How are soil textures classified?
a.
acidity
b.
grain size
c.
climate
d.
horizon
Hint
3.
What two variables control how fast a soil forms?
a.
type of parent rock and climate
b.
residual vs. transported soil
c.
type and age of parent rock
d.
temperature and pressure
4.
"Which type of soil has a high level of salt and can support only limited vegetation?
a.
a desert soil
b.
a temperate soil
c.
a polar soil
d.
a tropical soil
Hint
5.
__________ is the loose covering of broken rock particles and decaying organic matter that covers bedrock.
a.
regolith
b.
a sedimentary rock
c.
sediment
d.
soil
Hint
6.
"You find a soil sample with 50 percent sand, 20 percent silt, and 40 percent clay. Use the figure to determine the soil's texture.
a.
clay loam
b.
silt loam
c.
sandy clay loam
d.
loam
Hint
7.
"Soil that has been moved to a location away from its parent rock is called __________.
a.
transported soil
b.
organic-rich soil
c.
residual soil
d.
soil profile
Hint
