Antarctic: 2021’s massive ozone hole finally closes

The video discusses the changes in Earth's ozone layer, focusing on the 2021 Antarctic ozone hole, which was the 13th largest since 1979. It explains the causes of the ozone hole, including colder winters in the Southern Hemisphere and chemical reactions involving chlorine and bromine from human-made compounds. These reactions occur in the stratosphere and lead to ozone depletion when sunlight returns to Antarctica. The video also highlights the impact on southern countries, such as New Zealand, which often issue UV radiation warnings during their summer months.

What was significant about the 2021 Antarctic ozone hole?

• It was the largest ever recorded.

• It was the 13th largest since 1979.

• It was smaller than the 2020 hole.

• It did not affect any countries.

What is the ozone hole primarily a result of?

• Thinning of the ozone layer.

• A natural phenomenon unrelated to human activity.

• A complete absence of ozone.

• An increase in ozone production.

Which compounds are responsible for the chemical reactions that thin the ozone layer?

• Carbon dioxide and methane

• Sulfur and phosphorus

• Nitrogen and oxygen

• Chlorine and bromine

When do the reactions that destroy ozone typically occur?

• At the end of the Antarctic winter

• During the Antarctic summer

• Throughout the year

• Only during solar eclipses

Why do southern countries like New Zealand issue ultraviolet radiation warnings?

• To encourage tourism

• To promote sunscreen sales

• Because of the thinning ozone layer

• Due to increased cloud cover