Why Is a Bird- Foot Delta Like That of the Present-

question 1

Multiple Choice

Why is a bird- foot delta like that of the present- day Mississippi below New Orleans likely to change naturally toward one with the shape of an equilateral triangle like the upper- case, Greek letter delta (A) ?

• A)Present- day distributaries have higher gradients than potential new ones.
• B)Potential, new, distributary channels have higher gradients, causing downcutting of the existing channels.
• C)Increased sediment loads since the mid- nineteenth century have caused the major distributaries to be filled with sand.
• D)Potential, new, major distributary channels have steeper gradients than existing channels.

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