Answer:
The main reason airplanes fly in the stratosphere is because this is where the least amount of turbulence is found. In addition, because the stratosphere is very dry, there are fewer clouds in this layer, making for a much smoother ride overall.
Explanation:
 
        
                    
             
        
        
        
I would say : landslides, tsunamis, and liquefaction.
        
                    
             
        
        
        
Answer:
The crust because is the thinnest layer
 
        
                    
             
        
        
        
Answer:
Lava erupts from Earth and cools.
Explanation: