Answer: A  The Empire State Building was built much differently than skyscrapers today.
Explanation:
 
        
                    
             
        
        
        
I'm not for sure, but The mantle has convections that are believed to be responsible for the movement on the techtonic plates.
 
        
                    
             
        
        
        
The yellow river provided fertile farmland.
        
             
        
        
        
Um. Sorry not to be rude but please be a little more specific.. I don't know what's going on here haha