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1. The Maringouin delta formed 7,500 to 5,500 years ago when relative sea level rapidly rose. [6] 2. The Teche delta formed 5,500 to 3,500 years ago after relative sea level rise decelerated. [6] 3. The St. Bernard delta formed 4,000 to 2,000 years ago following an avulsion that caused the river's relocation to the east of present-day New ...
Delta_maps.pdf (604 × 339 pixels, file size: 60 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Most American geography and social studies classrooms have adopted the five themes in teaching practices, [3] as they provide "an alternative to the detrimental, but unfortunately persistent, habit of teaching geography through rote memorization". [1] They are pedagogical themes that guide how geographic content should be taught in schools. [4]
Mississippi Delta – green line marks boundary. The Mississippi Delta, also known as the Yazoo–Mississippi Delta, or simply the Delta, is the distinctive northwest section of the U.S. state of Mississippi (and portions of Arkansas and Louisiana) that lies between the Mississippi and Yazoo rivers.
A river delta is so named because the shape of the Nile Delta approximates the triangular uppercase Greek letter delta.The triangular shape of the Nile Delta was known to audiences of classical Athenian drama; the tragedy Prometheus Bound by Aeschylus refers to it as the "triangular Nilotic land", though not as a "delta". [8]
This process is also known as delta switching. Deposition from the river results in the formation of an individual deltaic lobe that pushes out into the sea. An example of a deltaic lobe is the bird's-foot delta of the Mississippi River , pictured at right with its sediment plumes.
The number of distributaries that are present is in part determined by the rate of sediment discharge, [4] and increased sediment discharge leads to more river bifurcation. This then leads to increased numbers of distributaries in deltas. Delta bifurcation has a typical angle at which it is observed, with a critical angle of approximately 72º. [5]
Lobes are rarely distinguished from one another in high tide settings as tidal currents favor channel stability and suppress avulsions. [4] The Nile, for example, is considered to be an arcuate delta because of its arc shaping. As it is waves that shape it into an arc, it also falls under the category of a wave-dominated delta.
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