Answer:
See below
Step-by-step explanation:
Ozone depletion refers to the thinning of the Earth's ozone layer, a region of the stratosphere that absorbs harmful ultraviolet (UV) radiation from the sun. This depletion is caused by human activities, primarily the release of ozone-depleting substances (ODS) into the atmosphere.
Major Causes of Ozone Depletion
- Chlorofluorocarbons (CFCs): CFCs are man-made chemicals that were widely used in refrigerants, aerosol propellants, and foam-blowing agents. When CFCs reach the stratosphere, they are broken down by UV radiation, releasing chlorine atoms. These chlorine atoms act as catalysts, breaking down ozone molecules and reducing the overall ozone concentration.
- Halons: Halons are a group of halogenated hydrocarbons that were primarily used as fire extinguishers. Similar to CFCs, halons break down in the stratosphere, releasing bromine atoms that also contribute to ozone depletion.
- Methane (CH4): While not as potent as CFCs or halons, methane, a naturally occurring greenhouse gas, also plays a role in ozone depletion. Methane breaks down in the stratosphere, producing hydroxyl radicals (OH) that can destroy ozone molecules.