What characteristic do scientists use to define four layers of earths atmosphere
        
        
     
    
 replied to:  kelsey2008
         
        
            
            Replied to:  What characteristic do scientists use to define four layers of earths...
         
        Here's a good webpage which should answer your question:
http://csep10.phys.utk.edu/astr161/lect/earth/atmosphere.html
        
        
     
    
 replied to:  kelsey2008
         
        
            
            Replied to:  What characteristic do scientists use to define four layers of earths...
         
        The characteristics use to define the four layers of earth atmosphere is the troposphere, stratosphere, mesosphere, and thermosphere.