question edit history translations

This is a rare phenomenon called iridescent clouds. It occurs in the clouds with ...

volcanic dusts

sulphuric acid

detergent vapors

small droplets or ice crystals

The effect is similar to irisation. Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light. Larger ice crystals do not produce iridescence, but can cause halos, a different phenomenon.

Ts

5

wikipedia → Cloud iridescence

atmospherecloudsillusionsnatureoptical illusionsopticssky

Atmosphere quiz Illusions quiz Clouds quiz

You will play as

Answers by country

Norway

6%

6%

0%

87%

16

Luxembourg

8%

0%

16%

75%

12

Canada

6%

10%

10%

73%

30

Germany

13%

11%

9%

65%

86

Australia

10%

10%

10%

63%

47

Singapore

0%

18%

18%

63%

22

Greece

8%

20%

8%

62%

24

Czech Republic

18%

12%

6%

62%

16

the United States

14%

17%

7%

60%

285

South Africa

20%

10%

0%

60%

10

the United Kingdom

17%

16%

6%

58%

168

Poland

15%

15%

11%

56%

22708

the United Arab Emirates

20%

20%

10%

50%

10

the Netherlands

21%

15%

10%

47%

19

Republic of Ireland

12%

41%

0%

45%

24

India

18%

24%

11%

43%

206

the Philippines

33%

25%

0%

41%

24

Egypt

20%

30%

10%

40%

10

Peru

20%

30%

20%

30%

10

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

refraction of light in ice crystals

refraction in the lens of the eye or lens

refraction of light in water drops

reflections from the water surface

Why is the ozone hole dangerous?

it speeds up the global warming

it increases UV radiation

it depletes the oxygen (O2)

it disturbs Earth's magnetic field

In which layer of the atmosphere the aurora is created?

In the Troposphere

In the Stratosphere

In the mesosphere

In the Thermosphere

Which two continents have no contact with the Atlantic Ocean?

Africa and Asia

Europe and Africa

Asia and Australia

Australia and North America