Question 1

Lakes in karst areas can disappear overnight.

Accepted Answer

A) True 
 B)False

Question 2

How can water percolating through soil become more acidic?

Accepted Answer

Carbon dioxide,produced by bac

Question 3

What flood control method has been put in place to protect the city of Venice?

Accepted Answer

A)  dykes 
B)  pumping of groundwater 
C)  sea walls 
D)  floodgates 
E)  none 
A)  dykes 
B)  pumping of groundwater 
C)  sea walls 
D)  floodgates 
E)  none

Question 4

Which two cities have issues with subsidence?

Accepted Answer

A)  New York and Vancouver 
B)  Venice and Vancouver 
C)  Mexico City and Tokyo 
D)  Los Angeles and San Francisco 
E)  London and New Orleans 
A)  New York and Vancouver 
B)  Venice and Vancouver 
C)  Mexico City and Tokyo 
D)  Los Angeles and San Francisco 
E)  London and New Orleans

Question 5

During the formation of karst topography,what typically happens to the water table?

Accepted Answer

A)  The water table rises. 
B)  The water table falls. 
C)  The water table intersects the surface. 
D)  The water table disappears. 
E)  The water table remains relatively constant. 
A)  The water table rises. 
B)  The water table falls. 
C)  The water table intersects the surface. 
D)  The water table disappears. 
E)  The water table remains relatively constant.

Question 6

Briefly explain how the withdrawal of subsurface fluids can lead to subsidence.

Accepted Answer

Withdrawal of fluids,such as o

Question 7

Which of the following processes could cause subsidence the most quickly?

Accepted Answer

A)  gypsum dissolution 
B)  permafrost thawing 
C)  clay-rich soils shrinking and swelling 
D)  earthquake 
E)  groundwater pumping 
A)  gypsum dissolution 
B)  permafrost thawing 
C)  clay-rich soils shrinking and swelling 
D)  earthquake 
E)  groundwater pumping

Question 8

Why is New Orleans sinking?

Accepted Answer

A)  It is built on soluble rocks. 
B)  Levees and dykes prevent the Mississippi from supplying new sediment to balance compaction. 
C)  The wetlands are disappearing. 
D)  Hurricanes are becoming stronger. 
E)  Modern buildings are too heavy and cause increased compaction. 
A)  It is built on soluble rocks. 
B)  Levees and dykes prevent the Mississippi from supplying new sediment to balance compaction. 
C)  The wetlands are disappearing. 
D)  Hurricanes are becoming stronger. 
E)  Modern buildings are too heavy and cause increased compaction.

Question 9

What two processes in organic (or swampy)soils lead to subsidence?

Accepted Answer

Swampy soils contain large quantities of

Question 10

Expansive soils are a larger problem in southern Canada than in northern Canada.

Accepted Answer

A) True 
 B)False

Question 11

Unique species have adapted to photosynthesize in the total darkness of caves in karst terrain.

Accepted Answer

A) True 
 B)False

Question 12

Subsidence of the land surface on the flank of a volcano indicates that

Accepted Answer

A)  the volcano is about to erupt. 
B)  the magma beneath the volcano has solidified underground. 
C)  the volcano has recently erupted. 
D)  the volcano has become dormant. 
E)  more hot magma has intruded into the magma chamber. 
A)  the volcano is about to erupt. 
B)  the magma beneath the volcano has solidified underground. 
C)  the volcano has recently erupted. 
D)  the volcano has become dormant. 
E)  more hot magma has intruded into the magma chamber.

Question 13

Piping is most common in

Accepted Answer

A)  mudstones. 
B)  limestone bedrock. 
C)  rock salt pockets. 
D)  silty/sandy sediments. 
E)  permafrost. 
A)  mudstones. 
B)  limestone bedrock. 
C)  rock salt pockets. 
D)  silty/sandy sediments. 
E)  permafrost.

Question 14

What (in the context of thermokarst)is the process of "piping"?

Accepted Answer

Piping occurs when water ponds on the su

Question 15

What is the most appropriate adjustment to subsidence hazards?

Accepted Answer

A)  Construct detailed geologic maps of subsidence hazards. 
B)  Construct detailed subsurface maps using ground penetrating radar. 
C)  Avoid building in subsidence-prone regions. 
D)  Require full risk disclosure to potential property buyers. 
E)  Deny insurance coverage to those who live in hazardous areas. 
A)  Construct detailed geologic maps of subsidence hazards. 
B)  Construct detailed subsurface maps using ground penetrating radar. 
C)  Avoid building in subsidence-prone regions. 
D)  Require full risk disclosure to potential property buyers. 
E)  Deny insurance coverage to those who live in hazardous areas.

Question 16

What is a disappearing (and/or reappearing)stream?

Accepted Answer

Disappearing streams occur in karst area

Question 17

Explain how subsidence associated with groundwater mining can be reduced.

Accepted Answer

Injection wells can be used to

Question 18

Which areas are most prone to subsidence?

Accepted Answer

A)  areas underlain by permafrost 
B)  swampy areas 
C)  areas underlain by limestone 
D)  river deltas 
E)  all of the above 
A)  areas underlain by permafrost 
B)  swampy areas 
C)  areas underlain by limestone 
D)  river deltas 
E)  all of the above

Question 19

A possible mitigation strategy to avoid the collapse of old coal mine adits or tunnels is to fill them with sand to support the roof.This strategy was employed in old gold mines in Timmins,Ontario.What happened over time to make this strategy ineffective?

Accepted Answer

A)  Pore water pressures within the sand increased and caused liquefaction subsurface. 
B)  Some of the sand washed away and no longer supported the tunnel roofs. 
C)  The sand settled and compacted, leaving voids into which the roofs collapsed. 
D)  The sand displaced subsurface water, raising the water table and flooding parts of the surface. 
E)  The sand allowed water to flow freely through pore spaces, dissolving more material from the mine walls. 
A)  Pore water pressures within the sand increased and caused liquefaction subsurface. 
B)  Some of the sand washed away and no longer supported the tunnel roofs. 
C)  The sand settled and compacted, leaving voids into which the roofs collapsed. 
D)  The sand displaced subsurface water, raising the water table and flooding parts of the surface. 
E)  The sand allowed water to flow freely through pore spaces, dissolving more material from the mine walls.

Question 20

How does vegetation affect the action of expansive soils?

Accepted Answer

Trees and shrubs withdraw water from the

Lakes in karst areas can disappear overnight.

How can water percolating through soil become more acidic?

What flood control method has been put in place to protect the city of Venice?

Which two cities have issues with subsidence?

During the formation of karst topography,what typically happens to the water table?

Briefly explain how the withdrawal of subsurface fluids can lead to subsidence.

Which of the following processes could cause subsidence the most quickly?

Why is New Orleans sinking?

What two processes in organic (or swampy)soils lead to subsidence?

Expansive soils are a larger problem in southern Canada than in northern Canada.

Unique species have adapted to photosynthesize in the total darkness of caves in karst terrain.

Subsidence of the land surface on the flank of a volcano indicates that

Piping is most common in

What (in the context of thermokarst)is the process of "piping"?

What is the most appropriate adjustment to subsidence hazards?

What is a disappearing (and/or reappearing)stream?

Explain how subsidence associated with groundwater mining can be reduced.

Which areas are most prone to subsidence?

A possible mitigation strategy to avoid the collapse of old coal mine adits or tunnels is to fill them with sand to support the roof.This strategy was employed in old gold mines in Timmins,Ontario.What happened over time to make this strategy ineffective?

How does vegetation affect the action of expansive soils?

Introduction to Natural Hazards

Internal Structure of Earth and Plate Tectonics

Earthquakes

Tsunamis

Volcanoes and Volcanic Eruptions

Landslides

Snow Avalanches

River Flooding

Atmosphere and Severe Weather

Hurricanes and Extratropical Cyclones

Waves, Currents, and Coastlines

Wildfires

Climate Change

Meteorite Impacts and Extinctions

Filters

Exam 8: Subsidence and Soil Expansion and Contraction

Lakes in karst areas can disappear overnight.

How can water percolating through soil become more acidic?

What flood control method has been put in place to protect the city of Venice?

Which two cities have issues with subsidence?

During the formation of karst topography,what typically happens to the water table?

Briefly explain how the withdrawal of subsurface fluids can lead to subsidence.

Which of the following processes could cause subsidence the most quickly?

Why is New Orleans sinking?

What two processes in organic (or swampy)soils lead to subsidence?

Expansive soils are a larger problem in southern Canada than in northern Canada.

Unique species have adapted to photosynthesize in the total darkness of caves in karst terrain.

Subsidence of the land surface on the flank of a volcano indicates that

Piping is most common in

What (in the context of thermokarst)is the process of "piping"?

What is the most appropriate adjustment to subsidence hazards?

What is a disappearing (and/or reappearing)stream?

Explain how subsidence associated with groundwater mining can be reduced.

Which areas are most prone to subsidence?

A possible mitigation strategy to avoid the collapse of old coal mine adits or tunnels is to fill them with sand to support the roof.This strategy was employed in old gold mines in Timmins,Ontario.What happened over time to make this strategy ineffective?

How does vegetation affect the action of expansive soils?

Introduction to Natural Hazards

Internal Structure of Earth and Plate Tectonics

Earthquakes

Tsunamis

Volcanoes and Volcanic Eruptions

Landslides

Snow Avalanches

River Flooding

Atmosphere and Severe Weather

Hurricanes and Extratropical Cyclones

Waves, Currents, and Coastlines

Wildfires

Climate Change

Meteorite Impacts and Extinctions

Filters