Discussion
Match each delta type with its dominant process.
List I
A. Birdsfoot delta
B. Cuspate delta
C. Estuarine delta
D. Arcuate delta
List II
1. tide dominated with elongated sand ridges
2. river dominated with weak marine action
3. a balance of river and wave influence
4. wave dominated and smoothed at the front
Answer: A
Correct answer: A-2, B-4, C-1, D-3
Delta shape records which process dominates. A birdsfoot delta such as the Mississippi forms where the river overwhelms weak waves and tides and builds distributary fingers seaward. An arcuate delta such as the Nile reflects a balance between river supply and wave rework. A cuspate delta is smoothed and pointed by strong wave action from both sides. An estuarine delta is tide dominated, with sand ridges elongated along the flow.
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