Understanding Earth's Ozone Layer

The video explains the ozone layer's role in absorbing harmful UV radiation, its formation and destruction cycle, and the impact of CFCs on ozone depletion. It highlights the international efforts to ban CFCs, leading to a decrease in emissions and signs of ozone layer recovery.

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

• To absorb harmful ultraviolet radiation

• To provide oxygen for breathing

• To reflect sunlight

• To trap greenhouse gases

What happens to ozone molecules when they absorb ultraviolet radiation?

• They convert into carbon dioxide

• They become stable and unreactive

• They form water vapor

• They release oxygen atoms and heat

What significant change occurred in the ozone layer after the 1970s?

• It completely disappeared in some regions

• Holes began to develop, especially near the South Pole

• It started to produce more oxygen

• It became thicker and more stable

Which substances were primarily responsible for the depletion of the ozone layer?

• Nitrogen oxides

• Methane

• Chlorofluorocarbons (CFCs)

• Carbon dioxide

What was the outcome of the international treaty regarding CFCs in the late 1980s?

• CFC emissions increased

• The treaty had no impact on CFC levels

• CFCs were banned, leading to a decrease in emissions

• CFCs were replaced with more harmful substances