Stream Erosion

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Southern New Hampshire University *

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103

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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 <1> 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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