Which Greek letter is used to describe a type of river mouth?

sigma
alpha
delta
gamma
Delta looks like Greek letter Δ. It is formed when deposition of sediment is more intensive than sea erosion.
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Answers by country

sigma
alpha
delta
gamma
answers
flagAustria
3%
3%
93%
0%
33
flagItaly
2%
4%
92%
2%
50
flagSwitzerland
0%
0%
92%
0%
13
flagFrance
7%
0%
92%
0%
13
flagGreece
5%
0%
91%
0%
34
flagGermany
5%
2%
90%
0%
196
flagRepublic of Ireland
0%
5%
89%
5%
19
flagRomania
5%
5%
88%
0%
17
flagCanada
3%
3%
85%
5%
56
flagPoland
7%
4%
84%
2%
16243
flagthe United Kingdom
9%
3%
79%
3%
201
flagAustralia
8%
3%
78%
3%
61
flagthe United States
8%
7%
77%
4%
752
flagthe Netherlands
15%
10%
73%
0%
19
flagMalaysia
13%
6%
73%
6%
15
flagUnknown
13%
13%
68%
4%
22
flagIndia
14%
11%
64%
3%
196
flagPakistan
23%
5%
61%
7%
39
flagNigeria
21%
7%
57%
0%
14
flagthe Philippines
16%
13%
56%
2%
37