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Homework answers / question archive / Question 1         In which of the following rock types is a sinkhole most likely to develop?           Answers:   Marble   Schist   Shale   Sandstone       Question 2         Why was the Dysart Drain a threat to Luke Air Force Base? Dysart Drain is now a threat to Luke Air Force Base (in the West Valley) because           Answers: The drain is contaminated from near by Morton Salt evaporating ponds

Question 1         In which of the following rock types is a sinkhole most likely to develop?           Answers:   Marble   Schist   Shale   Sandstone       Question 2         Why was the Dysart Drain a threat to Luke Air Force Base? Dysart Drain is now a threat to Luke Air Force Base (in the West Valley) because           Answers: The drain is contaminated from near by Morton Salt evaporating ponds

Geography

  • Question 1

 

   
 

In which of the following rock types is a sinkhole most likely to develop?

     

 

 

Answers:

 

Marble

 

Schist

 

Shale

 

Sandstone

     
  • Question 2

 

   
 

Why was the Dysart Drain a threat to Luke Air Force Base?

Dysart Drain is now a threat to Luke Air Force Base (in the West Valley) because

     

 

 

Answers:

The drain is contaminated from near by Morton Salt evaporating ponds. Luke gets it water from the drain.

 

 

It now drains toward the runway because of land subsidence and could cause it to flood after heavy rains.

 

The drain is removing groundwater from beneath the base, including the runway. This is causing the ground to crack and has disabled portions of the runway.

 

The Dysart Drain has been designated as a wetland. The protected wildlife is at risk from jet noise. This situation could force the closing of the base.

     
  • Question 3

 

   
 

Which of the following rocks cited in the lab PowerPoint was the most porous?

     

 

 

Answers:

sandstone

 

pumice

 

breccia

 

 

scoria

     
  • Question 4

 

   
 

Permeability is the

     

 

 

Answers:

measure of the pressure exerted on fluids within pore spaces in the rock

 

 

degree in which pore spaces are interconnected

 

a ratio between open spaces in the rocks and the hydraulic gradient

 

A measure of the open spaces in rocks or sediments

     
  • Question 5

 

   
 

Which of the following rock types would normally by the most permeable?

     

 

 

Answers:

shale

 

slate

 

pumice

 

 

conglomerate

     
  • Question 6

 

   
 

In this diagram the ground surface is shown as the top line (with palm trees) and the line below that is the water table and is identified. What will the water table look like in a few months if no water is added to the ground?

 

     

 

 

Answers:

 

D

 

C

 

B

 

A

     
  • Question 7

 

   
 

In this diagram, what is the area above the water table (area "A") called and what is the layer below it (area "B") called?

 

     

 

 

Answers:

A is the A horizon B is the B horizon

 

A is the area of recharge B is the area of discharge

 

A is the region of capillary action B is the region of cementation

 

 

A is the zone of aeration B is the zone of saturation

     
  • Question 8

 

   
 

The driving force for the hydraulic gradient is

     

 

 

Answers:

 

Gravity

 

The distance the water table is below the surface of the Earth.

 

The weight of the rocks above the water table.

 

The degree of permeability of the rocks or sediments.

     
  • Question 9

 

   
 

These lines represent water tables below the surface. Which profile would created the greatest hydraulic gradient giving the same amount of water and the same kind of rocks.

 

     

 

 

Answers:

 

A

 

B

 

C

 

D

     
  • Question 10

 

   
 

How does groundwater flow with respect to the groundwater contours?

     

 

 

Answers:

The groundwater flows independent of the contours. The groundwater flow mimics the surface drainage.

 

The groundwater flows parallel to the contours.

 

The groundwater flows over the contours.

 

 

The groundwater flows perpendicular to the contours.

     
  • Question 11

 

   
 

This set of diagrams shows the contours of the water table (in feet above sea level) in the blue map, and the surface map (with brown contour lines and farms). In the upper right hand area of the surface map a factory is dumping toxic waste into a sinkhole. Based on the water table contours, which farm will not be influenced by the toxic threat? (Note that this question is worth more points because of the extra work.)

 

     

 

 

Answers:

Farm A

 

 

Farm B

 

Farm C

 

Farm D

 

Farm E

     
  • Question 12

 

   
 

This Google Earth Image is of an area in southern Florida. A city (indicated) has accused a private landfill company of contaminating their primary water source, which is the big lake between the landfill and the city. A geological consultant was hired by the city to determine if the lake was being contaminated by the landfill. The numbers in the blue boxes represent the surface elevation of the lake next to the blue box. The geologist correctly concluded that

 

     

 

 

Answers:

The lake was not being contaminated by the landfill.

 

There is not enough information to make the determination. It will take more time and money to solve the difficult problem.

 

 

The lake was being contaminated by the landfill.

     
  • Question 13

 

   
 

This area in the above image is dominated by sinkholes. This type of a landscape is called

     

 

 

Answers:

Horst

 

Depressed

 

 

Karst

 

Cavernous

     
  • Question 14

 

   
 

This image is near the intersection of the Loop 303 and Olive Ave in the western part of the "Valley of the Sun". The canal and the road need repairs every year due to subsidence. The county has decided to fix the problem of subsidence in this area by

 

     

 

 

Answers:

Setting up water wells in the area to pump water out to stabilize the sediments.

 

Plant mesquite and palo verde trees in the area. These trees have deep roots and will stabilize the sediments.

 

Set up water wells and pump water into the ground to re-inflate the sediments.

 

 

The process of land subsidence is irreversible.

     
  • Question 15

 

   
 

What problem did I identify with Falcon Dunes Golf Course?

     

 

 

Answers:

 

It is not open to the public.

 

It is in an area that is experiencing significant subsidence.

 

It was constucted over an old landfill and now methane is escaping to the surface.

 

The water table in the area has dropped so far that the golf course wells are now not producing.

     
  • Question 16

 

   
 

In which type of strata is subsidence due to groundwater withdrawal most likely to occur?

     

 

 

Answers:

Shale

 

Limestone

 

Conglomerate

 

 

Sand and gravel

     
  • Question 17

 

   
 

What is unique about Bottomless Lakes State Park in New Mexico?

     

 

 

Answers:

The water in the lakes is very salty.

 

 

They were formed from the solution of gypsum and halite.

 

They were created subsidence associated with groundwater withdrawal.

 

They are extremely deep.  In some places they are over 750 feet deep.

     

 

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