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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.

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wikipedia → Cloud iridescence

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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