Stream Erosion
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Southern New Hampshire University *
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Geology
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Dec 6, 2023
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docx
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Module Two
<1>
Module Two
Eric Macias
Southern New Hampshire University
Module Two
<1>
Stream Erosion
A.
If you took a sample of water for Minnesota and looked thought a microscope you would
find sediment of material like
clay, silt, sand, and gravel. The finer sediment is deposited
upstream and has gone down the stream, and this sediment is from downcutting and
headward erosion.
B.
After letting the water evaporate you would see minerals because water is
high in
minerals from the dissolved
sediment. This would contain salt
, gravel,
and other minerals
found in groundwater from stream erosions.
C.
The sand and gravel in the riverbed of the stream
comes from eroded material from
upstream that is carried downstream by the current and the small material is deposited in
the slow-moving parts of the stream.
D.
This is due to the deepest portion of the stream being in the center and having a high
velocity and the slow velocity when the stream has contacted rock and sediment and the
friction is too great. The stones are too heavy to go downstream so they sit there.
Stream Deposition
Module Two
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A.
Due to the ocean acting as a draining basin, the river stopped, resulting in sediment
accumulating at the mouth.
B. Sediments
build up at
the mouth of the river when it slows down, which allows the river
to divide into multiple channels.
C.
Regression and transgression are the cause of this. Transgression, which is characterized
by the rise in sea levels relative to land level, this flooding. Transgression may result in
land sinking, tectonic activity, or severe climate change. Deeper sea sediments are
deposited on top of other soils as ocean water levels rise. In this case, it is likely that
alluvium deposits were left in the rising water. Then, as the water receded, they were
once more covered in tiny soil particles.
D.
This is because of the high velocity that the river creates causes the large volume of
dissolved solid to push out farther than the river mouth. Far offshore, where the
environment is low in energy, this is where a variety of fine sediment may be discovered.
E.
The Mississippi Delta in Louisiana is at the mouth of the river, where the water has
slowed and bottomed out, reaching its base level.
F.
While the landform of the two locations is comparable, the Nile River in Egypt has a
bigger influence due to its length-over 4,000 miles
comp
ared to the Mississippi River’s
2,320 miles (about 3733.68 km).
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Module Two
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Valley Development
A.
The emergence of a new drainage system during the early stages of valley development
marks the beginning of this landscape's transformation. At this stage, valleys with a V
form begin. There is currently no flood strategy in place. As the stream enters the mature
stage, groundwater and other water streams will increase its size or width; because of the
width rises, the stream starts to change its path in several bends or twists known as
meanders. Plans for flooding are also established. The stream slows down and begins to
form an oxbow lake in the last stage, known as the old age stage. When a broad river
meander is cut and left to stand, a U-shaped body of water forms.
Module Two
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Transgression Geology: Definition, Animation, and Comparison with Regression. (2019, May
25). Geology Degree.
https://geologydegree.org/transgression-geology
/
Harold Edwin Hurst, & El-Kammash, M. M. (2019). Nile River | Facts, Definition, Map, History,
& Location. In Encyclopedia Britannica.
https://www.britannica.com/place/Nile
-Rive
Wallenfeldt, J., & Muller, R. A. (2019). Mississippi River | History, Physical Features, Culture, &
Facts. In Encyclopedia Britannica.
https://www.britannica.com/place/Mississippi-River
Lutgens, F. K., & Tarbuck, E. J. (2021). Foundations of earth science. Pearson.