At the mouth of which of the following rivers the 'bird's foot' type delta is formed?

1. A

   Huang Ho

   (a) Huang Ho. The Huang He’s delta is a heavily silted, shifting coastal plain, not the classic bird’s-foot textbook type.

2. B

   Nile

   (b) Nile. The Nile builds an arcuate (fan) delta into the Mediterranean, the archetypal arcuate form, not bird’s-foot.

3. C

   Danube

   (c) Danube. The Danube delta on the Black Sea is a mixed lobate wetland, not the stored bird’s-foot example.

4. D

   Mississippi

   (d) Mississippi. The Mississippi builds a bird’s-foot (digitate) delta into the Gulf of Mexico, with long distributary fingers. That stored river is the official key.

Summary. Official key is (d) Mississippi. Bird’s-foot deltas are typed by the Mississippi. Nile is arcuate; Huang He and Danube are other delta styles. Neighbouring terms are distributary, levee and the Gulf of Mexico. Honour Mississippi for this paper.