Test Your Knowledge With This IQ Quiz


        
                    

                
            
    
        
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#1. Which river forms part of the border between the U.S. and Mexico? 
        
            
                
                    
                    Rio Grande
                
                Rio Grande            
        
        
            
                
                    
                    Colorado River
                
                Colorado River            
        
        
            
                
                    
                    Missouri River
                
                Missouri River            
        
        
            
                
                    
                    Mississippi River
                
                Mississippi River            
        
The Rio Grande serves as a natural boundary between the U.S. and Mexico.
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