Understanding the Ozone Layer and Its Protection

The video explains the ozone layer's role in protecting Earth from harmful UV rays. It discusses the discovery of the ozone hole in 1985 and the use of ozone-depleting substances. The Montreal Protocol, introduced in 1987, has significantly reduced these substances, with the UN reporting a 99% phase-out by 2023. The ozone layer is expected to recover by 2040, with the hole closing by 2066.

What is the primary function of the ozone layer in Earth's stratosphere?

• To absorb carbon dioxide

• To protect life from harmful ultraviolet rays

• To trap heat and warm the planet

• To produce oxygen for the atmosphere

In which year was the hole in the ozone layer discovered?

• 1985

• 1980

• 1990

• 1995

Which of the following is NOT a source of ozone-depleting substances?

• Solar panels

• Air conditioning units

• Aerosols

• Fire extinguishers

What was the main goal of the Montreal Protocol introduced in 1987?

• To promote renewable energy

• To reduce carbon emissions

• To phase out ozone-depleting substances

• To increase global temperatures

By what percentage had the Montreal Protocol phased out ozone-depleting substances by 2023?

• 75%

• 85%

• 100%

• 99%

By which year is the ozone layer expected to be repaired across much of the globe?

• 2040

• 2030

• 2050

• 2060