Answer:
C
Explanation:
cold thinks sink and are more dense, warm things rise and are less dense 
if my answer helps please mark as brainliest. 
 
        
                    
             
        
        
        
When air descends it compresses. When the air compresses the molecules in the air knock into each other more often, increasing the tempertature. 
Hope this helps
        
             
        
        
        
It’s c because a wave cycle is repeating patterns all over again and again
        
             
        
        
        
A Physical Change is what the change of ice is