Question 1

Where do mountain streams get most of their load of sediment?

Accepted Answer

A)  landslides,slope failures,and erosion of the mountain sides
B)  downward incision into bedrock
C)  abrasion of bedrock along the bottom of the channel
D)  alluvial fans

Question 2

What type of feature is shown in this figure?

Accepted Answer

A)  a braided stream
B)  river terraces
C)  alluvial fans
D)  entrenched meanders
E)  none of these

Question 3

Which of the following features is NOT present along the Colorado River?

Accepted Answer

A)  delta
B)  entrenched meanders
C)  tributaries that start in high mountains
D)  evidence for large prehistoric floods
E)  all of these are present

Question 4

Which of the following is unlikely to cause deposition of sediment along a stream?

Accepted Answer

A)  a decrease in gradient
B)  a decrease in water velocity
C)  a drop in sea level
D)  none of these

Question 5

Which of the following is a condition favoring deposition of sediment?

Accepted Answer

A)  an increase in water velocity
B)  a decrease in gradient of the stream
C)  an increase in turbulence of the water
D)  an increase in the salt content of the water
E)  a decrease in grain size as a clast breaks into two pieces

Question 6

Where would be the relatively safest place to build a bridge across the stream in the accompanying figure?

Accepted Answer

A)  between points 1 and 2
B)  between points 3 and 4
C)  between points 5 and 6
D)  between points 7 and 8

Question 7

At which site along this stream would a point bar form?

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 8

Which of the lettered sites would most likely be undercut by migration of a meander?

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 9

What type of stream is shown in this photograph?

Accepted Answer

A)  meandering stream
B)  braided stream
C)  a stream whose main channel has high sinuosity
D)  an esker

Question 10

Which of the following influences whether a flood occurs?

Accepted Answer

A)  the height of levees
B)  the amount of discharge
C)  urbanization (replacing farms or natural land with buildings) 
D)  the width of the channel
E)  all of these are influences

Question 11

What is the discharge of the stream shown in the accompanying figure if the velocity is 2 meters per second?

Accepted Answer

A)  300 cubic meters per second
B)  60 cubic meters per second
C)  32 cubic meters per second
D)  15 cubic meters per second
E)  none of these

Question 12

The gradient of the stream between the two ends on the accompanying figure is:

Accepted Answer

A)  1 meter per kilometer
B)  10 meters per kilometer
C)  100 meters per kilometer
D)  1 to 1
E)  6 to 1

Question 13

For the same discharge,which site is most likely to be flooded?

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 14

What is the most important data for studying the potential for flooding along a river for several decades into the future?

Accepted Answer

A)  precipitation records
B)  newspaper accounts of previous floods
C)  satellite photographs taken every ten years
D)  discharge data from stream gauges

Question 15

Which of the following is true about the base level of a stream:

Accepted Answer

A)  Base level indicates the normal (or base) flow level before flooding.
B)  The flat top of a mountain is the ultimate base level for most streams.
C)  A mountain is close to its base level if bedrock is close to the surface.
D)  Most streams have lower gradient close to their base level.
E)  Base level generally is near the steepest part of a stream's profile.

Question 16

The accompanying figure shows a series of river terraces.Which of these terraces is the youngest?

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 17

Which of the following can have a significant effect on a river?

Accepted Answer

A)  rises and drops in sea level
B)  tectonics
C)  types of bedrock in the river
D)  changes in climate
E)  all of these

Question 18

What could cause this stream to deposit sediment?

Accepted Answer

A)  a rise in base level,such as a rise in sea level
B)  subsidence of the land,producing slopes that are less steep
C)  both a rise in base level or subsidence of the land
D)  none of these

Question 19

Stream terraces represent:

Accepted Answer

A)  older floodplains of a river that has incised downward
B)  cutoff meanders of a meandering stream
C)  areas where sea level has risen and waves beveled across the coast
D)  none of these

Question 20

The accompanying figure shows a series of river terraces.Which two of these terraces are probably closest in age?

Accepted Answer

A)  A and B
B)  B and C
C)  C and D
D)  A and C

Exam 16: Streams and Flooding

What type of feature is shown in this figure?

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Which of the following is unlikely to cause deposition of sediment along a stream?

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The gradient of the stream between the two ends on the accompanying figure is:

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Where do mountain streams get most of their load of sediment?

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Stream terraces represent:

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What is the discharge of the stream shown in the accompanying figure if the velocity is 2 meters per second?

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Which of the lettered sites would most likely be undercut by migration of a meander?

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Which of the following can have a significant effect on a river?

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Where would be the relatively safest place to build a bridge across the stream in the accompanying figure?

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Which of the following is true about the base level of a stream:

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What could cause this stream to deposit sediment?

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At which site along this stream would a point bar form?

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The accompanying figure shows a series of river terraces.Which of these terraces is the youngest?

Correct AnswerverifiedShow Answer

What is the most important data for studying the potential for flooding along a river for several decades into the future?

Correct AnswerverifiedShow Answer

Which of the following is a condition favoring deposition of sediment?

Correct AnswerverifiedShow Answer

What type of stream is shown in this photograph?

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For the same discharge,which site is most likely to be flooded?

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The accompanying figure shows a series of river terraces.Which two of these terraces are probably closest in age?

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Which of the following features is NOT present along the Colorado River?

Correct AnswerverifiedShow Answer

Which of the following influences whether a flood occurs?

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