🙏 Free review 2020
Required Environmental Legislation
Major Environmental Disasters
✍️ Free Response Questions (FRQs)
🏜 Unit 1: The Living World: Ecosystems
1.1Introduction to Ecosystems
1.10Energy Flow and the 10% Rule
🐠 Unit 2: The Living World: Biodiversity
2.5Natural Disruptions to Ecosystems
👪 Unit 3: Populations
3.0Unit 3 Overview: Populations
3.1Generalist and Specialist Species
3.2K-Selected r-Selected Species
🌏 Unit 4: Earth Systems and Resources
4.3Soil Composition and Properties
🏖 Unit 5: Land and Water Use
5.7Meat Control Methods
5.9Impacts of Mining
⚡️ Unit 6: Energy Resources and Consumption
6.0Unit 6 Overview: Energy Resources and Consumption
💨 Unit 7: Atmospheric Pollution
7.1Introduction to Air Pollution
7.5Indoor Air Pollutants
7.6Reduction of Air Pollutants
♻️ Unit 8: Aquatic and Terrestrial Pollution
🔥 Unit 9: Global Change
9.1Stratospheric Ozone Depletion
9.4Increases in the Greenhouse Gases
⏱️ 2 min read
May 29, 2020
The atmosphere is organized into layers based on density and temperature.
Ozone (O3) in the stratosphere absorbs incoming electromagnetic radiation from the sun. Without the ozone, the UV rays would be able to hit organisms on Earth and cause negative health effects like cancer and cataracts.
Chlorofluorocarbons (CFCs) are a man-made chemical, created as a stable molecule to deliver other substances via aerosol. They were widely used in hairspray and air fresheners. Chlorofluorocarbons (CFCs) are highly stable and are able to travel into the stratosphere without reacting or breaking down. However, they do split apart when hit by incoming stratospheric electromagnetic radiation. Once broken into their components, they are highly reactive and bind with the available oxygen needed to continuously create and heal the ozone layer.
Image Courtesy of Wikimedia
Step 1: O3 + electromagnetic radiation → O + O2
Step 2: O + O2 → O3
The ozone is continuously splitting apart and reforming as it absorbs electromagnetic radiation.
One molecule of Chlorofluorocarbon can continuously bond with and destroy ozone.
Step 1: CFCl3 + electromagnetic radiation → Cl + CFCl2
A chlorofluorocarbon is hit by electromagnetic radiation causing it to lose a chlorine atom.
Step 2: Cl + O3 → ClO + O2
A chlorine atom removes an oxygen atom from an ozone molecule to make a ClO molecule
Step 3: ClO + O3 → Cl· + 2 O2
This ClO can also remove an oxygen atom from another ozone molecule; the chlorine is free to repeat this two-step cycle
🎥 Watch: AP Environmental Streams
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