Lab 13
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South Dakota State University *
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Geography
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Dec 6, 2023
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Lab 13
Ella Jolin
So, now for some questions
1.
How many peaks are above 3,400 feet?
List how tall each peak is (go with the highest
contour line that you can see). Please include an image of the google map with topo
lines. (5 points)
I believe there are 5 peaks above 3400ft. Their heights range from lowest to highest with the
lowest being two peaks at 3720ft, followed by 3880ft, 4040ft, and 4400ft.
2.
Let’s say that the base of Bear Butte is at 3,400 ft.
How many feet tall is each peak?
(If I
think there is a peak at 6,000 feet, then I subtract the base of 3,400 feet = 2,600 feet.) (5
points)
With the peaks listed above, their heights would be two peaks at 320ft, followed by 480ft, 640ft,
and 1000ft.
3.
Google Brookings, SD.
What elevation is the campus, based on this map? (5 points)
After googling Brookings, SD and locating campus, the elevation as shown on the topo map is
1600ft.
4.
Google Chamberlain, SD.
About what elevation is the river mapped at?
What is the
lowest-elevation contour you can find where I-90 crosses over? (5 points)
The elevation of the river seems to be mapped at around 1400ft. I would also say that the lowest
elevation contour I can find where I-90 crosses over is about 1400ft.
5.
The ground photograph below was taken in the Canadian Rockies.
This feature appears
to be stable, but this may be misleading.
It also seems that the sediments present in the
feature are sands and coarse material.
Please identify the type of mass movement
process involved in the creation of this landform and how the landform must have
evolved through time?
Is this feature still moving? (5 points)
The stable landform in the Canadian Rockies, characterized by sediments composed of sands
and coarse material, was likely formed through a rockslide or rockfall process. Over time,
forces like erosion weakened a slope, causing a large amount of rock to fall off and move
downhill. As it fell, the rock broke into smaller pieces, which were then left at the base of the
slope. While the landform currently appears stable, it's important to recognize that the
processes that started its formation could still be active. This could potentially lead to
instability risks.
6.
You decide to build your home on a slope [please don’t] and plant beautiful trees in the
surrounding area.
Some years later you notice that the trees you planted are slightly
tilted.
What process is responsible for the tilting of the trees?
Please be specific. (5
points)
The tilting of trees on a slope is a result of what is known as "soil creep." Soil creep is the slow
and unnoticeable movement of soil particles and debris due to gravity. Over time, temperature
fluctuations, freeze-thaw cycles, moisture content, and the angle of the slope contribute to the
movement of soil particles. As this creeping process continues, it can lead to the gradual tilting of
trees and other objects on the slope, as the ground beneath them shifts and settles. This
phenomenon, though slow, can become noticeable after several years and may impact the
stability and alignment of trees planted on the slope.
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