Chapter 16 Geography
In the system of stream orders, the smallest unit in the network is ___ order
1st order
A drainage basin includes
A drainage divide, surface ground water, subsurface groundwater flow, the valley bottom (All the above)
The eventual result of ___ is to reduce almost all stream carried debris to very small silt particles.
Abrasion
Human activity is an especially strong factor in
Accelerated erosion
During low water cycles, any channel bottom change is likely to be
Aggradation
The dry land equivalent to a delta is an
Alluvial fan
Which of the following rivers has the largest delta in the world? A. Mississippi B. Indus C. On D. Amazon E. Thames
B. Indus
An imaginary surface extending beneath the continents from sea level which limits how deep streams may cut is
Base level
Marking the outer edge of floodplain a are landforms called
Bluffs
Reduced flow may be caused by
Change in gradient, channel widening, channel bending, aggradation (All of the above)
The chemical erosion of stream channels is known as
Corrosion
Which is the most common type of drainage pattern?
Dendritic
The total volume of flow in streams is termed
Discharge
Branching channels crossing a delta are known as
Distributaries
Which of the following is not associated with delta formation? A. A decrease in gradient B. A decrease in velocity C. Distributaries D. Deposition E. All are associated with deltas
E. All are associated with deltas
Diminished flow may be the result of a gradient change or: A. Bedload increase B. Saltation C. Channel widening D. Convex slopes E. None of the above
E. None of the above
When a meandering stream cuts into a gradually rising crust or bedrock the result is an
Entrenched Meander
The detachment and removal of fragmented rock material is known as
Erosion
The most obvious of all depositional landscapes is the
Floodplain
Which sort of erosion involves the most material?
Gully
Any stream may lengthen it's valley by
Headward erosion
The stream valley lengthens at the expense of the
Interfluve
If a stream carries water only during and immediately after a rain, it is classified as
Intermittent
Streams which flow for only a part of the year are ____ streams
Intermittent
When a waterfall develops along a steam channel where bedrock of differing erosibility are found it is a
Knickpoint
Niagara Falls is one of the world's outstanding examples of
Knickpoint retreat
In Death Valley, base level is ___ ultimate base level.
Lower than
On a meandering stream, maximum erosion takes place on the
Outer edge
Fluvial process includes both the stream flow within valleys as well as
Overland flow
A typical drainage pattern on conic volcanic mountains would be
Radial
Stream terrace is strong evidence of a
Rejuvenation
The process in which small particles are moved along by water or wind in a series of jumps or bounces is
Saltation
First order streams are the
Shortest
The degree of turbulence in stream flow is determined by the velocity and the
Stream channel roughness
The greatest amount of material transported by a stream is carried in its
Suspended Load
Stream terraces are an indication
That rejuvenation may have occurred
The lowest possible limit of down cutting on a land mass is called
Ultimate Base Level
Downcutting is usually most prominent at the ___ part of a stream valley
Upper
...
W
Surface indicators of turbulence in stream flows include eddies and
Whirlpools
