What is Soil? Answers

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1
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Which layer of soil is most likely of greatest importance to plant growth?

A
O (organic matter)
B
A (topsoil)
C
B (subsoil)
D
C (parent rock)
3

Soil is a mixture of _______.

A
solids
B
solids, liquids, and gases
C
solids and liquids
D
solids and gases
5

Which of the following factors does not affect soil formation?

A
precipitation
B
time
C
erosion
D
none of the above
6

Which of the following will be most influenced by the amount of organic material?

A
soil color
B
soil texture
C
soil structure
D
number of horizons
7

Which of the following will be most influenced by the amount of organic material?

A
soil color
B
soil texture
C
soil structure
D
number of horizons
8

Which layer of soil is closest to the surface?

A
O (organic matter)
B
A (topsoil)
C
B (subsoil)
D
C (parent rock)
11

Why is soil important to plants?

A
It provides them with nutrients.
B
It provides them with water.
C
It provides them with a medium for growth.
D
All of the above
12

Why is soil important to plants?

A
It provides them with nutrients.
B
It provides them with water.
C
It provides them with a medium for growth.
D
All of the above
13

The rate of soil formation cannot be increased.

A
T
B
F
14

Which of the following factors does not affect soil formation?

A
precipitation
B
time
C
erosion
D
none of the above
15

Which of the following is defined as combinations of soil particles that vary in size and shape?

A
clay
B
aggregates
C
silt
D
loam
16

Soil is a mixture of _______.

A
solids
B
solids, liquids, and gases
C
solids and liquids
D
solids and gases
17

What causes soils and their horizons to differ?

A
differences in climates where the soils are formed
B
differences in plant and animal life in different locations
C
differences in the layout of the land
D
all of the above
18

Animals contribute to soil formation through decomposition of organic material.

A
T
B
F
19

Which of the following soil particle types is the largest?

A
sand
B
silt
C
clay
D
potassium
20

Where does the organic material in soil originate?

A
physical weathering
B
chemical weathering
C
decomposing plant and animal matter
D
the atmosphere

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