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Unit 2 Soil Characteristics

True/False
Indicate whether the statement is true or false.
 

 1. 

No single natural resource is more important to survival than our land.
 

 2. 

Soil’s fragile state can cause it to be destroyed almost overnight.
 

 3. 

Soil’s complexity prevents it from being replaced once destroyed.
 

 4. 

An ideal soil contains about 50 percent solid material and 50 percent pore space by volume.
 

 5. 

The organic material of soil consists of weathered mineral and rock particles ranging in size from submicroscopic to those readily visible to the human eye.
 

 6. 

Soil forms very quickly.
 

 7. 

Rocks are aggregates of minerals.
 

 8. 

Sedimentary rocks cover almost 99 percent of the Earth’s surface.
 

 9. 

Alluvial deposits are waterborne sediments left by moving freshwater.
 

 10. 

A soil survey report can be used as a land-use planning tool.
 

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

 1. 

Soil contains four components. Which of the following is not one of soil’s components?
A.
inorganic material
D.
air
B.
organic matter
E.
muck
C.
water
 

 2. 

The ____ of each main soil component varies from one soil type to another.
A.
color
C.
type
B.
percentage
D.
structure
 

 3. 

Which of the following is not one of the five categories of soil parent material?
A.
glacial deposits
D.
organic deposits
B.
loess deposits
E.
layer deposits
C.
alluvial and marine deposits
 

 4. 

Rocks are classified into three groups. Which of the following is not a rock classification?
A.
angular
C.
sedimentary
B.
igneous
D.
metamorphic
 

 5. 

____ rocks are formed by cooling molten materials.
A.
Angular
C.
Sedimentary
B.
Igneous
D.
Metamorphic
 

 6. 

____ rocks are formed by solidifying sediments.
A.
Igneous
C.
Sedimentary
B.
Angular
D.
Metamorphic
 

 7. 

____ rocks are igneous or sedimentary rocks that have been reformed.
A.
Igneous
C.
Sedimentary
B.
Angular
D.
Metamorphic
 

 8. 

Soils formed from ____ deposits cover most of the Midwest.
A.
glacial
C.
alluvial
B.
loess
D.
marine
 

 9. 

The Natural Resources Conservation Service (NRCS) classification process is a soil ____.
A.
classification
C.
hearing
B.
document
D.
survey
 

 10. 

The result of a soil survey is a soil survey ____.
A.
indication
C.
file
B.
report
D.
series
 

Matching
 
 
Match the question with the correct response
A.
parent materials
F.
minerals
B.
muck soils
G.
soil
C.
weathering
H.
organic deposits
D.
peat soils
I.
marine
E.
organic matter
J.
loess deposits
 

 1. 

The layer of natural materials on Earth’s surface containing both organic and inorganic material and capable of supporting plant life
 

 2. 

Made up of dead plant and animal materials in varying stages of decay
 

 3. 

Materials underlying soil from which the soil formed
 

 4. 

Solid, inorganically, chemically uniform substances
 

 5. 

Wind-blown silt
 

 6. 

Formed on ancient ocean floors
 

 7. 

Dead vegetation that becomes thick enough to support plant life
 

 8. 

Made up of recognizable plant materials
 

 9. 

More completely decayed so that plant parts are no longer recognizable
 

 10. 

When minerals and rocks are exposed to the weather and begin to break into smaller and smaller pieces
 



 
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