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Category: ESS 6.4 Stratospheric Ozone

  • ESS 6.4.3 [AHL] Further About Ozone Depletion

    ESS 6.4.3 [AHL] Further About Ozone Depletion

    Learning Objectives Ozone Reactions with CFCs and HCFCs Ozone-depleting substances (ODSs) release halogens such as chlorine and fluorine into the stratosphere, where they catalyze the breakdown of ozone molecules. The ozone layer is essential for sustaining life on Earth, as it forms a thin, protective shield over the planet through atmospheric circulation. Without this stratospheric…

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  • ESS 6.4.2 Ozone Depletion

    ESS 6.4.2 Ozone Depletion

    Learning Objectives Evidence and Causes of Ozone Depletion Ozone-Depleting Substances (ODSs) Substance Type Contains Chlorine? Contains Hydrogen? Ozone-Depleting Substance (ODS)? Greenhouse Gas (GHG)? Environmental Impact / Notes CFCs (Chlorofluorocarbons) – phased out ✅ Yes ❌ No ✅ Yes ✅ Yes Strongly deplete the ozone layer; highly stable in the atmosphere; banned under the Montreal Protocol.…

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  • ESS 6.4.1 The UV and Ozone

    ESS 6.4.1 The UV and Ozone

    Learning Objectives Solar Radiation The Sun emits electromagnetic (EM) radiation across a wide spectrum of wavelengths, ranging from low-frequency radio waves to high-frequency gamma rays. This electromagnetic spectrum encompasses infrared (IR) radiation, visible light, and ultraviolet (UV) radiation, each playing distinct roles within the Earth’s biosphere. Nearly all energy available at the Earth’s surface originates…

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