Question 1

Organic matter in soil is found principally in the

Accepted Answer

A)   A horizon.
B)   B horizon.
C)   C horizon.
D)   R layer.E) C) and D)
F) A) and D)

Question 2

Mechanical weathering can include all of the following except

Accepted Answer

A)   Salts crystallizing in cracks in rocks.
B)   Solution of limestone by acid rain.
C)   Water freezing and thawing in rocks.
D)   The action of plant roots working into crevices.E) B) and C)
F) All of the above B

Question 3

Higher organic matter content in the soil imparts a blackish coloration to the soil.

Accepted Answer

A) True 
 B)False

Question 4

Degradation of soil fertility has no effect on the farmland needed to feed the world by diminishing its availability.

Accepted Answer

A) True 
 B)False

Question 5

When soil is eroded from farmland,

Accepted Answer

A)   The nutrient-rich topsoil is least affected.
B)   Crop yields and crop nutritional quality may be reduced.
C)   New soil quickly forms replacing that which is lost.
D)   All of the choices are correct.E) A) and B)
F) A) and C)

Question 6

The color of a soil reflects

Accepted Answer

A)   Organic matter content (brown or black)  and iron content (red) .
B)   Type of vegetation growing on the soil.
C)   Development of peds.
D)   Degree of soil horizon maturity.E) A) and C)
F) A) and B)

Question 7

The basic strategy in controlling soil erosion is to slow down the eroding agents,wind and water.

Accepted Answer

A) True 
 B)False  True

Question 8

Soil erosion

Accepted Answer

A)   Adds sediment load to streams, affecting stream hydrology and biology.
B)   Adds sediments to coastal ocean water, blanketing light-dependent organisms such as corals and reducing their viability.
C)   Adds agricultural chemicals to stream water and coastal water.
D)   All are true.E) None of the above
F) A) and B)

Question 9

Based on the chemical composition of the minerals given below,weathering of ____________ produces sulfuric acid in solution.

Accepted Answer

A)   Quartz
B)   Calcite
C)   Pyrite
D)   HaliteE) C) and D)
F) A) and C)

Question 10

Which of the following is the most true?

Accepted Answer

A)   At this time, soil is eroding in the U.S. about 10 times faster than it is forming.
B)   Soil erosion is always easily reversible, using conservation techniques.
C)   Very little farmland in the United States has experienced moderate to severe erosion lately.
D)   The most important agent of soil erosion is winter frost heave.E) B) and C)
F) A) and D)

Question 11

The tendency of the soils to form clumps of soil particles or lumps is referred to as the soil

Accepted Answer

A)   Fertility.
B)   Texture.
C)   Structure.
D)   Chemistry.E) B) and C)
F) C) and D)

Question 12

Soil and water conservation can be brought about by techniques such as terracing and contour plowing that would slow down the surface runoff.

Accepted Answer

A) True 
 B)False  True

Question 13

Abundant water promotes chemical weathering because most of the relevant reactions involve water.

Accepted Answer

A) True 
 B)False

Question 14

Wetland soils may serve a water-purification role.

Accepted Answer

A) True 
 B)False

Question 15

The process by which soluble minerals are dissolved and removed from soil is termed

Accepted Answer

A)   Soil creep.
B)   Organic.
C)   Leaching.
D)   Erosion.E) All of the above
F) A) and C)

Question 16

Worldwide,the amount of arable land per capita is increasing as a consequence of expanded irrigation and improved farming methods.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following types of soil would be likely to drain most readily (be most permeable) ?

Accepted Answer

A)   Clay
B)   Silt
C)   Sand
D)   LoamE) A) and B)
F) A) and C)

Question 18

The B soil horizon is also known as

Accepted Answer

A)   The zone of leaching or zone of loss.
B)   The zone of accumulation or zone of gain.
C)   Bedrock.
D)   Topsoil.E) A) and B)
F) A) and C)

Question 19

Soils are formed by a series of processes commonly referred to as

Accepted Answer

A)   Lithification.
B)   Diagenesis.
C)   Sedimentation.
D)   Weathering.E) None of the above
F) B) and C)

Question 20

Terracing of farmland

Accepted Answer

A)   Is a very new soil-conservation method.
B)   Reduces surface-water runoff velocity and thus the efficiency of soil erosion and transport.
C)   Substantially reduces wind erosion by flattening field surfaces.
D)   Is only used on very steep slopes.E) B) and C)
F) A) and C)

Exam 12: Weathering, erosion, and Soil Resources

Organic matter in soil is found principally in the

Correct AnswerverifiedShow Answer

Mechanical weathering can include all of the following except

Correct AnswerverifiedB

Higher organic matter content in the soil imparts a blackish coloration to the soil.

Correct AnswerverifiedShow Answer

Degradation of soil fertility has no effect on the farmland needed to feed the world by diminishing its availability.

Correct AnswerverifiedShow Answer

When soil is eroded from farmland,

Correct AnswerverifiedShow Answer

The color of a soil reflects

Correct AnswerverifiedShow Answer

The basic strategy in controlling soil erosion is to slow down the eroding agents,wind and water.

Correct AnswerverifiedTrue

Soil erosion

Correct AnswerverifiedShow Answer

Based on the chemical composition of the minerals given below,weathering of ____________ produces sulfuric acid in solution.

Correct AnswerverifiedShow Answer

Which of the following is the most true?

Correct AnswerverifiedShow Answer

The tendency of the soils to form clumps of soil particles or lumps is referred to as the soil

Correct AnswerverifiedShow Answer

Soil and water conservation can be brought about by techniques such as terracing and contour plowing that would slow down the surface runoff.

Correct AnswerverifiedTrue

Abundant water promotes chemical weathering because most of the relevant reactions involve water.

Correct AnswerverifiedShow Answer

Wetland soils may serve a water-purification role.

Correct AnswerverifiedShow Answer

The process by which soluble minerals are dissolved and removed from soil is termed

Correct AnswerverifiedShow Answer

Worldwide,the amount of arable land per capita is increasing as a consequence of expanded irrigation and improved farming methods.

Correct AnswerverifiedShow Answer

Which of the following types of soil would be likely to drain most readily (be most permeable) ?

Correct AnswerverifiedShow Answer

The B soil horizon is also known as

Correct AnswerverifiedShow Answer

Soils are formed by a series of processes commonly referred to as

Correct AnswerverifiedShow Answer

Terracing of farmland

Correct AnswerverifiedShow Answer

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True

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