Section 2:  The Atmostphere

Chapter 3 Section 2 Presentation
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Key Terms:

• atmosphere
• troposphere
  
• stratosphere
  
• ozone
  
• radiation
  
• conduction
  
• convection
  
• greenhouse effect

Main Ideas:

• The mixture of gases that surrounds the Earth is called the atmosphere.
• The atmosphere is composed almost entirely of nitrogen and oxygen.
  
• Earth's atmosphere is divided into four layers based on changes in temperature that take place at different altitudes.
  
• Heat is transferred in the atmosphere by radiation, conduction, and convection.
  
• Some of the gases in Earth's atmosphere slow the escape of heat from Earth's surface in what is known as the greenhouse effect.