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
flagGermany
17%
57%
20%
5%
35
flagthe United Kingdom
18%
54%
9%
18%
22
flagthe United States
5%
53%
19%
19%
52
flagSwitzerland
25%
50%
25%
0%
12
flagPoland
12%
49%
15%
22%
2686
flagIndia
5%
42%
20%
31%
35