2. The main processes or work that rivers accomplish are to

erode, feed water into the ground and deposit sediment.
erode, transport sediment and feed water into the ground
transport and deposit sediment and feed water into the ground.
erode, transport and deposit sediment.

3. The speed or velocity of a river is affected mainly by the river's

slope, channel shape and dissolving ability.
slope, roughness and discharge.
channel shape, roughness and dissolving ability.
channel shape, roughness and abrasive ability.

4. The characteristic of a river that almost always increases downstream is (assume that the river does not flow into an arid region downstream and it is not used for irrigation)

roughness.
discharge.
dissolving ability.
abrasiveness.

5. As the velocity of a river increases, its

ability to deposit sediment decreases and its ability to erode increases.
roughness must decrease.
slope must increase.
discharge always increases.

6. The three main methods by which rivers erode are:

dissolution (dissolving), abrasion and braiding.
dissolution (dissolving), abrasion and scouring.
dissolution (dissolving), abrasion and hydraulic action.
hydraulic action, abrasion and scouring.

7. The method(s) of erosion that is/are most dependent upon the turbulence of the river is/are

abrasion and braiding.
abrasion and dissolving.
hydraulic scouring and abrasion.
hydraulic action.

8. Sediment is transported in several ways which include a bedload of

finer particles and a dissolved load of clay and silt.
coarser particles and a suspended load of clay and silt.
coarser particles and dissolved load of clay and silt.
finer particles and a suspended load of essentially invisible particles.

9. The development of a bar in or along a river may indicate

an increase in discharge
an increase in velocity.
a decrease in velocity.
an increase in the dissolved load.

10. Choose the correct statement concerning meander bends.

Erosion occurs on the outside, creating cut banks, deposition on the inside to give point bars.
Deposition occurs on the outside, creating cut banks, erosion on the inside to give point bars.
Deposition occurs on the outside, creating point bars, erosion on the inside to give cut banks.
Erosion occurs on the outside, creating point bars, deposition on the inside to give cut banks.

11. Meander bends continually

become wider.
become narrower.
change size and position.
form the exact same shape.

12. Which of the following is not true concerning natural levees?

They are low ridges along the edge of a river.
They are formed by floods.
They protect nearby areas during low floods.
They are eroded and rebuilt every year.

13. Choose the incorrect response concerning flood plains. A flood plain can be thought of as part of the river channel because

This is where rivers store discharge during times of flood.
This is where rivers store sediment.
The river has flowed over this area in the past and it will again in the future.
Without dams the flood plain would be covered with water most of the time.

14. A balance between erosion and ___?___ is created by a river. This means that if the

discharge; load increases the river will erode.
deposition; load decreases the river will erode.
deposition; deposition increases the river will also erode.
discharge; load increases then deposition will also increase.

15. Which is not an effect of dikes or rivers?

They narrow the channel which increases the velocity of flow.
They increase the velocity of flow which inhibits navigation.
They narrow the channel which causes scouring of the channel.
They increase the velocity of flow which increases deposition

Lesson 20 "Running Water II"

16. Often there is a close connection between a river and its valley. This is because the

valley existed first and captured the river.
valley guides the direction of the river.
river has cut the valley downward and mass wasting has widened it.
flow of the river alone is responsible for the size and shape of the valley.

17. The depth to which a river can erode is called the

thalweg and its maximum is dependent upon the river's discharge.
base level and its maximum is sea level.
base level and its maximum is dependent upon the river's velocity.
thalweg and its ultimate depth is dependent upon the river's velocity.

18. Characteristics of a river-valley system classified as old age would include

a well-developed flood plain that is near base level.
the river expending some of its energy side to side but most downward.
some rapids and the beginnings of a flood plain.
the river valley being wider and the velocity of flow being very slow.

19. Which of the following is not a correct association between the rock types and structure and the drainage pattern?

uniform or homogenous rock types produce a dendritic pattern.
intersecting fractures or faults produce a rectangular pattern
alternating harder and softer rock types produce a trellis pattern.
flat lying sedimentary rock layers also produce a rectangular pattern.

20. Which of the following would neither be a cause of nor a result of stream rejuvenation.

The uplifting of an area.
The lowering of sea level.
The deposition of a flood plain
An increase in discharge due to a change in climate.

21. Stream terraces can form when

an area is uplifted.
the base level is raised.
erosion is decreased.
deposition occur equally on both sides of the river.

22. Which is not a characteristic of incised meanders?

They are cut well below the level of the former flood plain
They are always accompanied by a few pairs of stream terraces.
They form fairly rapidly.
The flow pattern is maintained as down cutting occurs.

23. As streams come to an end they tend to

have their slopes increased and therefore slow down.
have their slopes decreased and therefore speed up.
lose energy and deposit sediment.
dam their channels and branch due to their increase in energy.

24. The Mississippi River

is presently following the shortest, steepest path to the gulf.
is presently following the shortest route to the gulf.
has its main distributary channel dammed for flood control.
has the main channel's path controlled by dikes and dams.

25. The Achafalaya River becomes a greater threat to capture the lower Mississippi River each year because the

amount of water flowing in the Achafalaya becomes much greater each year.
Mississippi is scouring its channel.
Mississippi is "silting in" while the Achafalaya is scouring its channel deeper.
Achafalaya is "silting in" making a smoother path to the sea.

Prepared by: Mike Mitchell

Be sure to review your quizzes before taking the test.