HW 13 Essential of Geology
Complete this analogy: Sliding is to gravel as dissolution is to_____________.
ions
Making sure that the Mississippi River Map is deselected, evaluate the city elevations directly under the dot for each city location and the river height 0.25 km south of the north end of the transect line. (The elevation of the ground under your cursor is shown at the bottom of your screen.) Which of the following statements about the elevations of Alton, West Alton, and the Mississippi River is correct?
Alton is 18 m higher than West Alton
Which of the following is likely to occur to an incised meander after it reaches equilibrium with its new base level?
The incised meander will cause only minor erosion of the canyon walls.
While working in the field, you come upon a stream that flows in a very deep V-shaped valley. Regarding the history of this stream, which of the following statements is most likely true?
The stream is relatively young.
Match each of the following processes with one of the three zones shown on the figure of a river system. Drag the appropriate labels to their respective targets.
Top- Sediment production Middle- Sediment transport Bottom- Sediment deposition
Complete this analogy: Bouncing is to sand as suspension is to_____________.
clay
What type of stream is associated with the formation of an oxbow lake?
meandering stream
How can pieces of rock in contact with a stream bed move?
rolling, sliding, bouncing
What is suspended load?
the fine-grained particles that travel in the water column above the stream bed
Which processes result in the widening of the floodplain of a meandering stream?
undercutting and lateral erosion
What causes meandering streams to downcut and become incised meanders?
uplift of the land the stream is flowing on
How many kilometers wide was the main channel of the river before the flood (1991)?
1.2 km
Where do deposition and erosion of material occur along a meander?
Deposition occurs on the inside of the meander, whereas erosion occurs on the outside.
Sort these items into the appropriate bin. Use each item once, and place only one item per bin.
Divide- Appalachian Moutains Watershed- Missouri River Basin Tributary- Big Horn River Trunk Steam- Mississippi River
Sort these items into the appropriate bin. Use each item once, and place only one item per bin.
Divide- a boundary, usually a hill or mountain, where water will flow in opposite directions on either side. Wateshed- an area in which all water falling in it flows out through one location Tributary - a river that feeds into another river Trunk Stream- the primary river flowing out of a drainage basin.
Stream terraces form as the result of which of the following processes?
Downcutting following the rise of the landscape produces stream terraces.
Which of the following statements about drainage basins is FALSE?
Drainage basins only contain one river.
Water falling in Illinois would ultimately end up where?
Gulf of Mexico
Which of the following statements accurately describe the erosional processes of meanders that are incising and meanders that are in equilibrium? Choose all that apply.
Meanders in equilibrium erode primarily in a side-to-side manner. Incising meanders erode primarily by downcutting.
How are oxbow lakes formed?
Oxbow lakes form when one meander erodes into another, cutting off water to part of the stream channel.
Which of the following features would you expect to find on the outside bank of a stream meander loop?
a cut bank
What is a meander scar?
a landscape feature formed after an oxbow lake dries up
What is an oxbow lake?
a meander that has been cut off from the original stream channel
When the local gradient of a stream changes as it goes from a mountainous area to a large flat-lying area, which of the following features could form?
an alluvial fan
What are the three types of loads carried by streams?
bed load, suspended load, dissolved load
What is the dominant fluvial process in a clear, sediment-poor stream moving down a steep slope?
downcutting
In a delta, sedimentary layers deposited under circumstances that appear to violate the Principle of Original Horizontality are found in which of the following circumstances?
foreset beds
Which of the following are part of the bed load? CHOOSE ALL THAT APPLY.
gravel sand
