Climate 101: Ozone Depletion | National Geographic

What is the ozone layer made of and where is it found?

• A gas called oxygen, found in the troposphere.

• A gas called ozone, found in the stratosphere.

• A gas called carbon dioxide, found in the mesosphere.

• A gas called nitrogen, found in the exosphere.

What is the primary role of the ozone layer for Earth?

• It helps regulate Earth's temperature.

• It absorbs harmful ultraviolet (UV) radiation from the sun.

• It produces oxygen for living organisms.

• It creates clouds and weather patterns.

Which chemicals are the main cause of ozone layer depletion?

• Carbon dioxide

• Methane

• Chlorofluorocarbons (CFCs)

• Nitrogen oxides

How do chlorofluorocarbons (CFCs) damage the ozone layer?

• They block sunlight from reaching the ozone layer.

• They react with oxygen atoms in ozone, breaking apart ozone molecules.

• They increase the temperature of the ozone layer, causing it to expand.

• They absorb ozone molecules, preventing them from protecting Earth.