Ozone layer

The video explains the ozone layer's role in absorbing 97-99% of harmful ultraviolet radiation. Ozone is formed in the upper atmosphere when ultraviolet light splits oxygen molecules, creating free oxygen atoms that react with other oxygen molecules to form ozone (O3).

At what altitude is the ozone layer primarily located?

• 10 kilometers

• 50 kilometers

• 200 kilometers

• 100 kilometers

What percentage of harmful ultraviolet radiation does the ozone layer absorb?

• 100%

• 70 to 80%

• 50 to 60%

• 97 to 99%

What is the primary function of the ozone layer?

• To absorb harmful ultraviolet radiation

• To provide oxygen for breathing

• To reflect sunlight

• To trap greenhouse gases

How is ozone formed in the upper atmosphere?

• By the condensation of water vapor

• By the combination of nitrogen and oxygen

• Through the splitting of water molecules

• When ultraviolet light splits oxygen molecules

What happens to free oxygen atoms in the upper atmosphere?

• They combine with nitrogen to form nitrogen oxides

• They escape into space

• They form carbon dioxide

• They react with oxygen molecules to form ozone