The Upper Mississippi River and the Lower Mississippi River have very different stream morphologies due in part because of the geology of the two regions
What is the basic geology of each region (What material is the river flowing over?), how does the geology control the river, and what is the morphology of the river as a result?What will be an ideal response?
Answer: The Upper Mississippi River is a bedrock-dominated system, which generally contains the river in one location and doesn't allow major lateral migrations. As a result, the morphology of the river is closer to a straight channel. The Lower Mississippi, on the other hand, is an alluvial stream and flows over deltaic sediments deposited over the last few million years. These sediments cannot lock the Mississippi in one location, so the river has historically migrated, cutting broad meander loops and creating oxbow lakes. The channel morphology of the Lower Mississippi is a meandering stream.
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