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6th Grade: Soil Formation And Horizons
Test Description: Answer these questions on soil formation and horizons.
Instructions: Answer all questions to get your test result.
1) The organic layer of soil that is made of still identifiable items is
A
humus
B
clay
C
litter
D
bedrock
2) How long does it take for fertile topsoil to form?
A
a couple of years
B
about 10 years
C
hundreds of years
D
billions of years
3) Which horizon is known as bedrock?
A
Horizon R
B
Horizon C
C
Horizon A
D
Horizon B
4) Which layer would be best to use to help plants grow?
A
topsoil
B
parent material
C
subsoil
D
bedrock
5) Which is not needed for soil formation?
A
lava
B
parent material
C
climate or water
D
time
6) Which layer is solid rock?
A
bedrock
B
humus
C
horizon B
D
horizon A
7) Which of the following would you expect to be very nutrient rich?
A
bedrock
B
sand
C
humus
D
gravel
8) Which horizon layer is known as parent material?
A
O
B
A
C
B
D
C
9) Which horizon is found at the top?
A
O
B
B
C
R
D
A
10) Which layer is made of parent material?
A
Horizon C
B
Horizon B
C
Horizon O
D
Horizon A
*select an answer for all questions
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