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In which layer of the atmosphere the aurora is created?

In the Troposphere
In the Stratosphere
In the mesosphere
In the Thermosphere
Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost.
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Answers by country

In the Troposphere
In the Stratosphere
In the mesosphere
In the Thermosphere
answers
flagAustralia
12%
24%
8%
56%
25
flagGreece
16%
16%
16%
50%
12
flagIndia
17%
28%
13%
39%
123
flagAustria
17%
32%
3%
39%
28
flagthe United States
21%
30%
13%
34%
83
flagPoland
22%
35%
18%
23%
1932
flagthe United Kingdom
21%
30%
23%
23%
42
flagRepublic of Ireland
20%
50%
10%
20%
10
flagGermany
28%
36%
15%
18%
149
flagthe Netherlands
18%
54%
18%
0%
11

The bright circle around the Sun seen in the picture is known as a halo. What causes it?

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sulphuric acid
detergent vapors
small droplets or ice crystals

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