In this video Paul Andersen explains how stratospheric ozone protects humans from ultraviolet light. He explains how stratospheric ozone is formed when diatomic oxygen absorbs an ultraviolet photon and is split into two free oxygen atoms. The free atoms bond with another oxygen molecule to form an ozone molecule creating a stable ozone layer. He then explains how chlorine atoms released from chlorofluorocarbon molecules act as an enzyme to breakdown up to 100,000 ozone molecules. The Montreal Protocol was a treaty signed by countries on the planet to reduce the amount of CFCs in the atmosphere to protect the ozone layer.


  • Science > Ecology

Education Levels:

  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


ozone, stratospheric ozone,



Access Privileges:

Public - Available to anyone

License Deed:

Creative Commons Attribution Non-Commercial
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Curriki Rating
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On a scale of 0 to 3

This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of 2016-11-30.

Component Ratings:

Standards Alignment: 3
Subject Matter: 3
Deeper Learning: 3

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