Ozone Layer and Its Depletion

The video explains the Earth's atmosphere and the electromagnetic spectrum, focusing on the role of ozone in protecting against harmful UV radiation. It details the formation and destruction of ozone molecules, highlighting the catalytic cycle involving chlorine atoms. The impact of human-made CFCs on ozone depletion is discussed, along with the discovery of the ozone hole over Antarctica. The video concludes with international efforts to reduce harmful chemicals and protect the ozone layer.

Which part of the electromagnetic spectrum is visible to the human eye?

• Visible light

• Infrared

• Radio waves

• Gamma rays

What is the primary function of ozone in the stratosphere?

• To reflect gamma rays

• To produce oxygen

• To absorb infrared radiation

• To protect us from ultraviolet radiation

What is the chemical formula of ozone?

• CO2

• H2O

• O3

• O2

How is ozone formed in the stratosphere?

• By the absorption of infrared radiation

• By the reaction of oxygen atoms with oxygen molecules

• By the breakdown of water molecules

• By the combination of nitrogen and oxygen

What happens when a chlorine atom collides with an ozone molecule?

• It forms water

• It forms carbon dioxide

• It forms nitrogen dioxide

• It forms chlorine monoxide and an oxygen molecule

What is a catalytic cycle in the context of ozone depletion?

• A process that destroys ozone

• A process that creates ozone

• A process that creates carbon dioxide

• A process that creates water

What has caused the five-fold increase in chlorine in the stratosphere since the 1970s?

• Increased volcanic activity

• Increased industrial activity releasing CFCs

• Increased solar radiation

• Increased deforestation

Why do CFCs pose a significant threat to the ozone layer?

• They are absorbed by plants

• They are water-soluble

• They break down easily

• They are not water-soluble and reach the stratosphere intact

When was the dramatic decrease in ozone over the South Pole discovered?

• 1990

• 1975

• 1980

• 1985

What is the term used to describe the significant reduction in ozone over the South Pole?

• Ozone layer

• Ozone shield

• Ozone hole

• Ozone gap