Its renewed again and again by natural water cycle
 
        
                    
             
        
        
        
Answer:
Animals needs oxygen's to survive and plants need carbon dioxide to survive. The ozone layer reflects harmful UV rays from the sun to protect the things living on Earth. 
 
        
                    
             
        
        
        
Answer: TEST YOUR STRENGTH!!!!! (mortal kombat reference btw) sorry if that dosnt help idk what it is
 
        
             
        
        
        
In the meaning of wave x it would be solid