True. Radioactive wastes can decay in days or it can take up to millions of years. 
        
                    
             
        
        
        
Answer:
Part of this border follows a natural boundary.
Explanation: 
The answer is this one because Its a natural line between texas and Mexico and there are no mountains
 
        
             
        
        
        
Bureau of Land Management, Fish and Wildlife Service, Forest Service, and National Park Service