2-1Science

docx

School

Southern New Hampshire University *

*We aren’t endorsed by this school

Course

103

Subject

Geography

Date

Apr 3, 2024

Type

docx

Pages

Uploaded by CountRaven2946

Michael East 20 Jan 2024 PHY 103 2-1 Assignment With stream erosion if I were to get a sample of the water from the stream in Minnesota, I would discover that there are various grains of rocks that have been deposited from further up the stream. The small sediment grains would be easily visible under a microscope and the reason we would see these grains is because of the changes in the landscape through processes like headward erosion, cutbanks and downcutting which cause changes in the landscape and the movement of and through the stream. If I let the water evaporate, I would see the collection of minerals in the dish and the reason for this is because the water can only hold a certain amount of minerals. If the minerals themselves are too large to be dissolved, then they form solid minerals and sink to the bottom of the dish. I would say that the formation of sand on the inside of the riverbed would contain particles from upstream and even from the erosion of stream meanders. It is common that when there is slower water movement, the heavier grains become deposited due to their inability to stay with the stream. Cobblestones are found near the middle of the stream as it is the deepest point with the highest velocity. For streams that move like a straight channel, the center of the stream would be

this point. The cobblestones would be too heavy to remain within the carry capacity of the water within the channel. The ocean acts as a drainage basin in relation to many rivers. When the rivers reach the ocean, it loses a lot of its energy and around there erosion wouldn’t extend past that point. However, a large amount of sediment would be deposited at the mouth of the river, and it could, depending on its strength, be washed away from the mouth and right out to sea. It is very common for the sediment to form barriers, deltas and lagoons due to the large buildup. When sediment is deposited near the mouth of the river into the oceans, it typically will form a delta which causes many different streams or channels for the water to move through. These are very common when a river hits another body of water where the river would become shallower. Well the reason you are standing on a layer of very fine soil and just beneath you there are layers of coarse alluvium are because of the processes known as transgression and regression. With transgression it is the migration of a shoreline out of a basin and onto land, basically a flood. With transgression it is very possible that while the water was rising it was leaving deposits of alluvium. With regression, it is the very opposite, it is where the water is submerging and leaving the fine particles of soil. Fine sediment can be found offshore it isn’t super uncommon, When the deeper water has lower energy levels, they are only capable of carrying small sediments. If the land were to extend further the sediment would remain in the lower energy and deeper areas of the water itself. Well at the current point the river would have met with the ocean and that forms a drainage basin. In this drainage basin it would collect sediment from the river that were

deposited into many formations such as deltas, lagoons and barriers. The newly formed deltas beneath the waters surface would allow for many channels to be formed in the mouth of the river. When the transgressions and regressions would happen, the sea level would rise above the land and deposit particles of the sediment which it would be unable to carry when the water is to recede. As the particles leave areas of such high energy the remain in areas of low energy causing erosion and the change in the land over time. Well the Nile river is almost 4000 miles long, which makes it much more powerful than the land formation itself, allowing for the erosion of the lands and the transportation of a lot of sediment, causing deltas within the Nile. The evolution of the landscape begins with a brand-new drainage system in which the river is constantly in a state of sliding and deepening. As the river deepens in the ocean, the basin is created which creates valleys, deltas, lagoons or barriers. At this time there isn’t any specific flood plan but when there are high gradient streams, they could be classified as Yazoo streams which tend to run parallel to the lower gradient river until they connect to the move developed river. With more mature streams, you have erosion processes like downcutting and headward erosion which possibly could make an oxbow lake which would be more of a U-shaped body of water. National Geographic. (2021, May 3). Valleys . Science. https://www.nationalgeographic.com/science/article/valleys#:~:text=These%20geological %20formations%20are%20created%20by%20running%20rivers%20and%20shifting %20glaciers.&text=Valleys%20are%20depressed%20areas%20of,gravity%2C%20water %2C%20and%20ice. Otieno, M. O. (2018, January 22). What is a Yazoo Stream? . WorldAtlas. https://www.worldatlas.com/articles/what-is-a-yazoo-stream.html

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Scientific Community and Research Tools - CK-12 Foundation. (n.d.). https://www.ck12.org/studyguides/earth-science/scientific-community-and-research-tools- study-guide.html Watersheds and drainage basins completed . Watersheds and Drainage Basins | U.S. Geological Survey. (n.d.). https://www.usgs.gov/special-topics/water-science-school/science/watersheds-and- drainage-basins What is river and stream erosion? . American Geosciences Institute. (2016, November 17). https://www.americangeosciences.org/education/k5geosource/content/rocks/what-is-river- and-stream-erosion

2-1Science

Related Documents