Understanding the Ozone Layer

The video explains the ozone layer's role in protecting Earth from UV radiation and how pollution, particularly CFCs, has led to its depletion. It covers the structure of the atmosphere, the chemical reactions causing ozone breakdown, and the global efforts to reduce ozone-depleting substances, highlighting the Montreal Protocol's success in reducing atmospheric chlorine levels.

What is the primary function of the ozone layer?

• To provide oxygen for breathing

• To trap greenhouse gases

• To act as a barrier against ultraviolet radiation

• To regulate Earth's temperature

Which layer of Earth's atmosphere contains the ozone layer?

• Thermosphere

• Troposphere

• Stratosphere

• Mesosphere

What is the main component of the ozone layer?

• Carbon dioxide

• Methane

• Nitrogen

• Ozone

What are CFCs primarily used in?

• Fertilizers

• Refrigerants and aerosols

• Batteries

• Textiles

How do CFCs contribute to ozone depletion?

• By releasing carbon dioxide

• By reacting with oxygen atoms in ozone

• By increasing UV radiation

• By forming new ozone molecules

What is a common misconception about ozone layer damage?

• It is not affected by temperature

• It is only over the equator

• It is a thin patch

• It is a complete hole

Which region is most affected by ozone layer thinning?

• The Tropics

• The Antarctic

• The Arctic

• The Equator

What international agreement helped reduce ozone-depleting substances?

• Kyoto Protocol

• Paris Agreement

• Montreal Protocol

• Geneva Convention

By when do scientists estimate chlorine levels will return to normal?

• In 100 years

• In 50 years

• In 10 years

• In 20 years

What is the expected size of the Antarctic ozone hole in the future?

• Larger than 10 million square miles

• Smaller than 8 million square miles

• Unchanged

• Completely closed