Stratospheric Ozone Depletion

Front

What is stratospheric ozone?

Back

Stratospheric ozone is a layer of ozone (O3) located in the stratosphere, approximately 10 to 30 miles above the Earth's surface, that absorbs the majority of the sun's harmful ultraviolet (UV) radiation.

Front

What causes the formation of ozone in the stratosphere?

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Ozone is formed when ultraviolet (UV) radiation, specifically UV-C radiation, splits oxygen molecules (O2) into individual oxygen atoms, which then react with other oxygen molecules to form ozone (O3).

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What is the Montreal Protocol?

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The Montreal Protocol is an international treaty established in 1987 aimed at phasing out the production and consumption of ozone-depleting substances, particularly chlorofluorocarbons (CFCs).

Front

Which type of UV radiation is most strongly absorbed by ozone?

Back

UV-C radiation is the type of ultraviolet radiation that is most strongly absorbed by ozone in the stratosphere.

Front

What are CFCs?

Back

Chlorofluorocarbons (CFCs) are man-made chemical compounds used in refrigeration, air conditioning, and aerosol propellants that contribute to ozone depletion.

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What are HFCs and why are they a concern?

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Hydrofluorocarbons (HFCs) are chemicals that replaced CFCs in many applications. They are now a concern because they are potent greenhouse gases that contribute to global warming.

Front

What ecological consequences arise from reduced stratospheric ozone?

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Ecological consequences include increased UV radiation leading to higher rates of skin cancer, cataracts, and harm to marine ecosystems, as well as reduced productivity in terrestrial biomes.

Front

Which of the following is NOT an ecological consequence of reduced stratospheric ozone?

Back

Reduced crop yield is NOT considered a direct ecological consequence of reduced stratospheric ozone.

Front

How does UV radiation affect human health?

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Increased exposure to UV radiation due to ozone depletion can lead to higher incidences of skin cancer, eye cataracts, and weakened immune response.

Front

What role does ozone play in protecting the Earth?

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Ozone in the stratosphere acts as a shield, absorbing the majority of the sun's harmful UV radiation, thus protecting living organisms on Earth.