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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
bedrock
C
clay
D
litter
2) How long does it take for fertile topsoil to form?
A
hundreds of years
B
a couple of years
C
about 10 years
D
billions of years
3) Which horizon is known as bedrock?
A
Horizon B
B
Horizon C
C
Horizon R
D
Horizon A
4) Which layer would be best to use to help plants grow?
A
subsoil
B
bedrock
C
parent material
D
topsoil
5) Which is not needed for soil formation?
A
parent material
B
time
C
lava
D
climate or water
6) Which layer is solid rock?
A
bedrock
B
horizon B
C
horizon A
D
humus
7) Which of the following would you expect to be very nutrient rich?
A
bedrock
B
gravel
C
humus
D
sand
8) Which horizon layer is known as parent material?
A
C
B
B
C
A
D
O
9) Which horizon is found at the top?
A
A
B
O
C
B
D
R
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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