What is the name of this phenomenon?

advection
iridescence
rainbow
Morning Glory
Iridescence is the phenomenon of certain surfaces that appear to gradually change colour as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, butterfly wings and sea shells, as well as certain minerals. It is often created by structural coloration (microstructures that interfere with light).
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Answers by country

advection
iridescence
rainbow
Morning Glory
answers
flagAustralia
9%
81%
3%
6%
33
flagCzech Republic
9%
72%
9%
9%
11
flagRepublic of Ireland
0%
71%
7%
21%
14
flagGreece
5%
64%
0%
29%
17
flagAustria
7%
59%
1%
28%
52
flagGermany
16%
58%
20%
2%
302
flagthe Philippines
13%
56%
8%
17%
23
flagthe United Kingdom
14%
55%
15%
14%
63
flagIndia
5%
54%
18%
21%
85
flagthe United States
6%
53%
20%
17%
135
flagPoland
11%
52%
14%
20%
4549
flagSwitzerland
20%
47%
29%
2%
102