La capa de ozono

The video explains the importance of the ozone layer in protecting Earth from harmful UV rays. It discusses the discovery of the ozone hole over Antarctica and attributes its cause to chlorofluorocarbons (CFCs) used in aerosols and refrigerators. Despite bans on CFCs in the 1990s, their long-lasting effects continue to damage the ozone layer. However, recovery efforts are underway, and scientists predict the ozone hole will close in 50 years. The video emphasizes the need for continued protection of the ozone layer to safeguard life on Earth.

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

• To reflect sunlight back into space

• To produce oxygen for humans

• To increase the Earth's temperature

• To absorb harmful ultraviolet rays from the sun

What significant discovery did scientists make in 1985 regarding the ozone layer?

• The ozone layer was unaffected by pollution

• The ozone layer was thicker than expected

• A large hole was found over Antarctica

• The ozone layer was completely destroyed

What are chlorofluorocarbons (CFCs) commonly used for?

• To purify water

• As a food preservative

• In the production of aerosols and refrigerants

• As a fuel for vehicles

What action did many countries take in the 1990s to protect the ozone layer?

• They increased the use of CFCs

• They banned the use of CFCs

• They reduced the production of oxygen

• They built more factories

How long is it expected to take for the ozone layer to fully recover?

• 10 years

• 20 years

• 50 years

• 100 years