Section 2:  The Ozone Shield

Chapter 13 Section 2 Presentation
File Size:	483 kb
File Type:	ppt

Download File

---

Key Terms:

• ozone layer
• chlorofluorocarbons (CFCs)
  
• ozone hole
  
• polar stratospheric clouds
  

Main Ideas:

• The ozone layer in Earth's stratosphere absorbs most of the ultraviolet (UV) light from the sun.
• Chlorofluorocarbons are human-made chemicals that destroy ozone molecules and damage the ozone layer.
  
• Ozone levels measured over the polar regions have been decreasing over the past several decades.
  
• Thinning of the ozone layer increases the amount of ultraviolet light that reaches Earth's surface.