Deck 39: Slopes and Streams

Question 1

The most important agent in the modification of landscapes is:

A) glaciers
B) wind
C) waves
D) streams

Answer 1

D

Question 2

Two ways streams modify landscapes are by _____ and _____.

A) Erosion; deposition
B) Erosion; transportation
C) Deposition; weathering
D) Transportation; deposition

Answer 2

A

Question 3

Rainsplash erosion is greater on:

A) flat land
B) granite bedrock
C) steep slopes covered with soil
D) areas covered by vegetation

Answer 3

C

Question 4

Regarding the Mississippi River system, the _____________ is the trunk stream and the _________ and _________ are tributary streams.

A) Arkansas; Platte; Columbia
B) Ohio; Mississippi; Arkansas
C) Arkansas; Potomac; Mississippi
D) Mississippi; Ohio; Missouri

Question 5

The complete river system of the trunk and its tributaries occupies a region known as the drainage basin.

Question 6

The amount of sediment passing through a portion of a trunk stream is termed the ________ of the basin.

A) discharge
B) sediment outflow
C) sediment yield
D) sedimentation

Question 7

To determine the erosional effectiveness of a stream, one would need to:

A) determine the sediment yield and divide by the areas of its drainage basin
B) measure the area of the drainage basin and divide it by its sediment yield
C) divide the width of the trunk by the total width of all its tributaries
D) cannot be determined

Question 8

Based on the relief of the drainage basin, which would you expect to have the highest sediment yield?

A) The Ganges
B) Mississippi
C) Amazon
D) none of these

Question 9

Which factors influence the amount of sediment yield?

A) Amount of precipitation
B) Topographic relief
C) Type of lithology
D) Amount of vegetation
E) All of the above

Question 10

Which type of flood causes the most modification to a landscape?

A) rare large floods
B) frequent small floods
C) infrequent medium floods
D) floods don't modify landscapes

Question 11

The average time between floods of a given magnitude is its:

A) discharge
B) sediment yield
C) erosional effectiveness
D) recurrence interval

Question 12

Which process of erosion is responsible for deepening the river channel and for developing potholes?

A) hydraulic action
B) abrasion
C) corrosion
D) deposition

Question 13

Water in a river with a large suspended load will appear:

A) very clear
B) mostly clear but slightly muddy
C) very muddy
D) none of these

Question 14

The ultimate base level for a river is:

A) water ponded behind a dam
B) a lake into which a river enters and empties from
C) the deepest point along the river
D) the ocean

Question 15

Aggradation near the upstream section of the longitudinal profile of a stream will result in:

A) increased stream power and decreased profile steepness
B) decreased stream power and increased profile steepness
C) increased stream power and increased profile steepness
D) decreased stream power and decreased profile steepness

Question 16

Where is a stream's load deposited?

A) in the delta
B) in the stream itself
C) on the floodplain
D) all of the above

Question 17

Which is typically the least important form of stream erosion?

A) corrosion
B) abrasion
C) hydraulic action
D) headward erosion