Question 1

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 2

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 3

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. B

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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.

Question 6

Wetland soils may serve a water-purification role.

Accepted Answer

A) True 
 B)False

Question 7

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)   Halite

Question 8

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)   Loam

Question 9

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.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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.

Question 12

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.

Question 13

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.

Question 14

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 15

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.

Question 16

Organic matter in soil is found principally in the

Accepted Answer

A)   A horizon.
B)   B horizon.
C)   C horizon.
D)   R layer.

Question 17

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

Accepted Answer

A)   Lithification.
B)   Diagenesis.
C)   Sedimentation.
D)   Weathering.

Question 18

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 19

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.

Question 20

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.

Exam 12: Weathering, erosion, and Soil Resources

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

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

Mechanical weathering can include all of the following except

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

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

Wetland soils may serve a water-purification role.

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

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

When soil is eroded from farmland,

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

Soil erosion

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

The color of a soil reflects

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

Terracing of farmland

Organic matter in soil is found principally in the

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

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

The B soil horizon is also known as

Which of the following is the most true?