Module Two Assignment

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Southern New Hampshire University *

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103

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Geography

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Dec 6, 2023

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docx

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Module Two Assignment: Stream Erosion, Deposition, and Valley Development. Stream Erosion:  A: While investigating Minnesota’s water samples you will find sediment and minerals. You might find dissolved sediment that was worn down by the process of abrasion, this is also called a dissolved load. Some of this sediment could be silt or clay as they may have been in suspension. As sediment is carried down a stream, it is eroded away by the moving water or by hitting other rocks or sediment. This sediment could have been carried miles away from the land it was originally eroded from. The minerals you find could be calcium and magnesium.  B: Once the water is evaporated, you will see some carbonate sediments created through erosion. They might be left behind because they were unable to be dissolved.  C: Inside a riverbed of a stream or river is sand, which came from upstream. Overtime it was eroded due to weathering and running water. Any grains that are too big or heavy are released because the river cannot carry that load. These grains are then deposited into the riverbed.  D: Cobble stones found in the deepest part of the stream, usually the middle, are deposited there because they are too heavy for the river to continue to carry. One reason the middle may be so deep is because the cobblestones deposited there will swirl around cutting into the riverbed to make deep holes, also known as potholes. Stream Deposition:

 A: Oceans are the end point of rivers. They act as a drainage basin. Any material that was eroded throughout the river ends at the ocean level. The river’s energy dissipates at the ocean, which is why the material leftover will not extend pass the ocean level.  B: Deltas are formed when the river becomes shallow. Deltas formed near the coast cause the river channel to break or branch out into multiple waterways.  C: The reason why you are standing on a layer of fine soil, but underneath you are layers of coarse alluvium is due to transgressions and regressions. The shoreline shifts to higher ground when the sea level rises, which results in flooding. This is how finer sediment can be deposited in different areas.  D: Beds of very fine sediment can be found far away from shore due to a fast-moving river transferring large amounts of sediment farther out and expanding past the mouth as its coast moves further out. Very fine sediments found far offshore are due to low energy environments.  E: In Louisiana there is the Mississippi river drainage basin delta is at the rivers mouth, which empties out into the ocean, the streams energy and gradient have slowed down and bottomed out.  F: The landforms of this river and the Nile River are similar, but the Nile River has a much larger impact on the land surrounding it since it is much larger than the Mississippi River. The Nile River is 4,258 miles long while the Mississippi River is only 2,350 miles long. Valley Development:  A: In the early stages of a streams evolution, it creates a new drainage system. The new high gradient streams can be referred to as Yazoo streams. When a high gradient stream

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