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3.1.2 Ozone Destruction: A Catalytic Process


  • poster board
  • crayons, markers, or colored pencils
  • rulers
  • protractors
  • 6 sets yellow 1/5-in. round dot stickers (carbon atoms)
  • 6 sets red 1/5-in. round dot stickers (chlorine atoms)
  • 6 sets blue 1/5-in. round dot stickers (fluorine atoms)
  • 12 small boxes white "reinforcements" (oxygen atoms), as used for file folder pages
  • overhead projector
  • transparency of Activity 3.1.2, Blackline Master # 15, Ozone Destruction


Pass out materials to students. Explain that they will be using colored dots to represent chemical elements. Each student will be responsible for creating a visual display of the ozone destruction (depletion) process.



  1. Use Activity 3.1.2 Ozone Destruction transparency to illustrate the process of ozone depletion.
  2. Allow students time to create their individual poster illustrating this concept.
  3. Students should explain process to a teammate.


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Go on-line and download maps of Antarctica showing the ozone hole since 1986.

Research the causes of ozone depletion on Earth. What's being done in the United States and internationally to slow the rate of ozone depletion?

  • Why is ozone loss greater at the Poles? Is the loss greater in the Antarctic or Arctic region? Why? At what time of year is the loss the greatest?
  • What is the difference between "good" and "bad" ozone? Where is the "bad" ozone found?

Research NASA's TOMS (Total Ozone Mapping Spectrometer). How does it work? What data has been collected so far and what does the data indicate?

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How much do you weigh?

Because humans are consumers in a food web, every kilogram of our bodies was built out of nutrients from other plants and animals. Scientists estimate that the ratio of input to resulting body mass is about 1 to 10 (1:10). This means that to make 1kg of your weight, your body required about 10 kg of nutrients. Those 10 kg were made from 10 times that amount of the next item in the food chain.

An expanding and continuing ozone hole over the Antarctic could have serious results. All life in the world's oceans depends on phytoplankton. Through the process of photosynthesis, these tiny "drifting plants" convert carbon dioxide and water (see Activity 3.2) into carbohydrates, fats and proteins. If they are destroyed by UV radiation, the entire ocean food web would be upset.

As a rough and ready example of the "multiplier effects" involved in food chains, if you'd been raised on a diet of seafood, compute the number of kilograms of inputs farther down the food chain it might have taken to reach your present weight:

blank kg. you weight times 10 blank kg. shrimp times 10 blank kg. larvae times 10 blank kg phytoplankton

Try the same exercise with a beef diet:

blank kg. you weight times 10 blank kg. beef times 10 blank kg. grain

And with a vegetarian diet:

blank kg your weight times 10 blank kg corn or rice

Suggested URLs

EPA's Stratospheric Ozone Web site: science of ozone depletion, regulations, and many links:

NASA Ames' resource files for teachers and students, particularly middle to high schoolers.

Includes animation of 1995 ozone hole data and links to current NOAA ozone images.

NASA's Facts-Fact Sheet on Ozone from modeling to monitoring projects.

Earth Observing Systems Project at NASA, Goddard: history of TOMS (Total Ozone Mapping Spectrometer) and live image links.

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Last Update: 1/18/97
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