Peralta Community College District
Physical Geography
Rita D. Haberlin, Instructor

Surface Water Quiz

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Important:   When you answer a question, a response box will appear.   You must close this response box before continuing the quiz.  There are 15 questions in this quiz.
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1. Which one of the following processes causes potholes to form in a streambed?

Mechanical Weathering
Hydraulic Action
Solution
Abrasion
2. Which one of the following supplies base flow (a constant supply of water) to a stream?
Overland flow after precipitation
Rainfall during thunderstorms
Groundwater seeping into the stream channel
Snowmelt
3. Which one of the following is the key factor controlling stream erosion, transport, and deposition?
Sediment Load
Velocity
Gradient
Temperature
4. The volume of water that flows past a given point in a given time is the stream's:
Capacity
Discharge
Gradient
Load
5. The limiting level below which a stream cannot erode is known as the:
Meander
Base Level
Gradient
Discharge
Velocity
6. Which stream channel cross-section causes the LEAST amount of frictional drag?
Semicircular
Rectangular
Narrow and Deep
Shallow and Rocky
Shallow and Wide
7. What is the form of stream erosion that flushes material from the sides and bottom of the stream channel?
Hydraulic Erosion
Abrasion
Solution
8. What is the sediment deposit that forms when a stream enters the sea or a lake?
An Alluvial Fan
A Natural Levee
A Delta
A Floodplain
9. Which one of the following statements is true about dams?
They help build up beaches
They lower the water table
They cause deposition below the dam
They cause erosion below the dam
10. The most common drainage pattern in rivers is:
Radial
Trellis
Dendritic
Irregular
11. The pebbles and boulders that are transported by a stream along the bottom of its channel are called:
Bedload
Suspended Load
Dissolved Load
Overload
12. Where does the water flow fastest in a meandering stream?
In the center of the channel
Along the outside edge of each bend or meander
Along the inside edge of each bend or meander
13. Rejuvenation of a stream channel (renewed erosive activity) can be caused by:
A higher sea level
A lower sea level
A decreased gradient
Increased load
14. Which of the following is true of streams as cities with concrete and asphalt cover large areas of the landscape (urbanization)?
Base flow decreases
Surface water runoff increases
Rivers erode more
Flashfoods increase
All of the above are true
15. How does a stream change as its discharge increases?
Stream velocity, channel width and depth, all increase
Stream velocity increases, but channel width and depth decreases
Stream velocity, channel width and depth, all decrease
Stream channel depth and width increases, load decreases, and velocity decreases

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