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Published byMorgan Copeland Modified over 6 years ago
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The Ozone Layer GOALS: Explain how the ozone layer shields the Earth from harmful radiation. Describe how CFCs are damaging the ozone layer. What are impacts for a thinner ozone layer.
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Ozone Layer Ozone Layer:
An area of the stratosphere with high concentrations of ozone gas Acts like a sun screen blocking out UV rays Ozone = O3 Good ozone vs. Bad Ozone
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Ozone Depletion Chlorofluorocarbons (CFCs) Man-made chemical
“Miracle Chemical” Damages the ozone layer Takes a LONG time to get to ozone layer and destroys many ozone molecules
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CFCs Used for decades Each CFC molecule can destroy 100,000 ozone molecules over decades
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Ozone Hole Antarctic Ozone Levels
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Impacts of Thinning Ozone Layer
Damage to skin cells (including skin cancers) Damage to eyes UV Light damages DNA Kills phytoplankton (single-celled organisms) which are the base of most ocean food chains UV light damages crops
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Wide Ranging Impacts
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Protecting the Ozone Layer
Montreal Protocol: international agreement in 1987 to phase out CFC usage Second conference in 1992 in Copenhagen WHY WILL IT STILL BE A PROBLEM FOR MANY MORE DECADES?
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Section Review Explain how the ozone layer shields the Earth from harmful radiation. Describe how CFCs are damaging the ozone layer. What are impacts for a thinner ozone layer. OZONE DEPLETION IS NOT THE SAME AS GLOBAL WARMING!!! Exploring the Ozone Layer (video)
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