Question 1

If the cross-section shown here were typical of the main channel of a long river,would you expect the river to dry up as you followed it downstream?

Accepted Answer

A)   Yes, because the water is contaminated.
B)   Not if there were additional tributaries entering it downstream.
C)   Yes, because it is in a desert.
D)   No.E) None of the above
F) C) and D)

Question 2

Unconsolidated sediment typically has greater porosity than lithified rock which it forms.

Accepted Answer

A) True 
 B)False

Question 3

Extensive pumping of fresh groundwater from wells near a seacoast is most likely to induce ____________.

Accepted Answer

A)   saline intrusion; with time the well will start to deliver saline water
B)   saline expulsion; with time the freshwater/saline water interface within the aquifer will be pushed downward and seaward
C)   mineral deposition of salts within the aquiferD) A) and B)
E) A) and C)

Question 4

An aquifer that is isolated from Earth's surface by an aquitard is ____________.

Accepted Answer

A)   supersaturated
B)   confined aquifer
C)   unconfined
D)   unsaturated zoneE) A) and B)
F) None of the above

Question 5

In the figure below,the flecked material to the right of the fault would be considered a(n) ____________.

Accepted Answer

A)   aquifer
B)   aquitard
C)   artesian well
D)   perched aquiferE) A) and D)
F) B) and D)

Question 6

Rock or sediment between the water table and the land surface represents a(n) ____________.

Accepted Answer

A)   aquitard
B)   confined aquifer
C)   unconfined aquifer
D)   unsaturated zoneE) C) and D)
F) All of the above

Question 7

In unfractured rock and sediment,water molecules usually take a ____________.

Accepted Answer

A)   straight path
B)   wandering path
C)   circular pathD) All of the above
E) A) and B)

Question 8

The rate of groundwater flow per unit area through a body of rock or sediment depends ____________.

Accepted Answer

A)   only on the slope of the water table locally
B)   only on the porosity of the rock or sediment
C)   on the slope of the water table and the porosity of the rock or sediment
D)   on the slope of the water table and the permeability of the rock or sedimentE) A) and D)
F) A) and C)

Question 9

Groundwater ____________.

Accepted Answer

A)   rarely, if ever, contains dissolved ions
B)   dissolves calcite and limestone
C)   can contain dissolved minerals but can never precipitate minerals out of solution
D)   can precipitate minerals but only if the ions that would form the mineral in question are undersaturated in the waterE) B) and C)
F) C) and D)

Question 10

Which of the following is not evidence for karst topography?

Accepted Answer

A)   salt beds
B)   sinkholes
C)   limestones
D)   disappearing streamsE) B) and C)
F) B) and D)

Question 11

A body of permeable,saturated rock or sediment into which water can percolate directly from the ground surface is termed a(n) ____________.

Accepted Answer

A)   aquitard
B)   confined aquifer
C)   unconfined aquifer
D)   unsaturated zoneE) A) and C)
F) A) and B)

Question 12

Which factor listed here would not affect the flow of water at a spring?

Accepted Answer

A)   the concentrations of various ions and man-made pollutants
B)   conditions of either drought or heavy rainfall at the recharge area
C)   the interconnectedness of fractures or pore spaces leading to the spring
D)   a decline in the water table in the direction from which groundwater feeds the springE) B) and C)
F) A) and D)

Question 13

Freshwater lakes are always discharge areas.

Accepted Answer

A) True 
 B)False

Question 14

A well-sorted sediment will have ____________ porosity than a poorly sorted sediment.

Accepted Answer

A)   greater
B)   less
C)   approximately the sameD) B) and C)
E) A) and C)

Question 15

Besides its immense size,what else is unusual about Carlsbad Caverns in southeastern New Mexico?

Accepted Answer

A)   Geologists think the system was produced by sulfuric acid rather than carbonic acid.
B)   The caverns are within a deposit of rock salt rather than limestone.
C)   The caverns were formed within the span of just a few days in 1937.
D)   Although there are conduits to the surface, the caverns do not host a population of bats.E) C) and D)
F) All of the above

Question 16

Material through which water readily flows is termed ____________.

Accepted Answer

A)   fluent
B)   porous
C)   permeableD) None of the above
E) A) and C)

Question 17

Perched water tables occur ____________.

Accepted Answer

A)   above the regional water table, within permeable rock or sediment
B)   above the regional water table, within impermeable rock or sediment
C)   below the regional water table, within impermeable rock or sediment
D)   below the regional water table, within permeable rock or sedimentE) A) and C)
F) A) and B)

Question 18

Topography dominated by depressions formed by the collapse of caves is termed ____________.

Accepted Answer

A)   valley and ridge
B)   karst
C)   horst and grabenD) B) and C)
E) A) and C)

Question 19

Land subsidence is likely when ____________.

Accepted Answer

A)   groundwater recharge occurs
B)   the Ca and Mg content of groundwater increases
C)   the water table changes
D)   discharge lowers the water tableE) B) and D)
F) A) and C)

Question 20

Neither methane nor hydrogen sulfide are naturally-occurring in well-water.

Accepted Answer

A) True 
 B)False

Exam 16: A Hidden Reserve: Groundwater

Perched water tables occur ____________.

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An aquifer that is isolated from Earth's surface by an aquitard is ____________.

Correct AnswerverifiedShow Answer

Rock or sediment between the water table and the land surface represents a(n) ____________.

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Which of the following is not evidence for karst topography?

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A body of permeable,saturated rock or sediment into which water can percolate directly from the ground surface is termed a(n) ____________.

Correct AnswerverifiedShow Answer

Besides its immense size,what else is unusual about Carlsbad Caverns in southeastern New Mexico?

Correct AnswerverifiedShow Answer

Unconsolidated sediment typically has greater porosity than lithified rock which it forms.

Correct AnswerverifiedShow Answer

Material through which water readily flows is termed ____________.

Correct AnswerverifiedShow Answer

The rate of groundwater flow per unit area through a body of rock or sediment depends ____________.

Correct AnswerverifiedShow Answer

In the figure below,the flecked material to the right of the fault would be considered a(n) ____________.

Correct AnswerverifiedShow Answer

Topography dominated by depressions formed by the collapse of caves is termed ____________.

Correct AnswerverifiedShow Answer

A well-sorted sediment will have ____________ porosity than a poorly sorted sediment.

Correct AnswerverifiedShow Answer

Land subsidence is likely when ____________.

Correct AnswerverifiedShow Answer

Neither methane nor hydrogen sulfide are naturally-occurring in well-water.

Correct AnswerverifiedShow Answer

In unfractured rock and sediment,water molecules usually take a ____________.

Correct AnswerverifiedShow Answer

If the cross-section shown here were typical of the main channel of a long river,would you expect the river to dry up as you followed it downstream?

Correct AnswerverifiedShow Answer

Extensive pumping of fresh groundwater from wells near a seacoast is most likely to induce ____________.

Correct AnswerverifiedShow Answer

Groundwater ____________.

Correct AnswerverifiedShow Answer

Freshwater lakes are always discharge areas.

Correct AnswerverifiedShow Answer

Which factor listed here would not affect the flow of water at a spring?

Correct AnswerverifiedShow Answer

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