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El Nino
Great Lakes
Teacher Info

Gather Data.1

Get Activity pages for this lesson.This section has two pages. Click on the pdf icon at left if you do not have an  activity sheet for this section.

A - Ozone Eaters

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  1. How is ozone distributed in the atmosphere?
  2. What is the "ozone hole?"
  3. Besides CFCs, what other molecules destroy ozone?

B - Proof of Damage

checkmarkClick here to go to the EVIDENCE site. pdf

  1. As the concentration of chlorine rises, what happens to the concentration of ozone?

C - Natural vs. Artificial

checkmarkClick here to go to the CHLORINE SOURCES site. pdf

  1. Since nature makes compounds that have chlorine in them, why haven't we had an ozone hole before now? What is it about some human-made chlorine compounds that makes them harmful to the ozone layer?
  2. What percent of the chlorine in the stratosphere comes exclusively from human sources?