Well there are many words that can answer that. Is there a word box or hints towards the specific words? If not just say heavily. 
        
                    
             
        
        
        
Why might a post classical civilization want to conquer Mesopotamia? It's fertile land provided the foundation for the first human civilizations and its access to the Persian Gulf and location between Europe, Asia, and Africa made it a center of trade. 
 
        
             
        
        
        
Answer:
Glacier Landforms: Trough. Glacial troughs, or glaciated valleys, are long, U-shaped valleys that were carved out by glaciers that have since receded or disappeared. Troughs tend to have flat valley floors and steep, straight sides. Fjords, such as those in Norway, are coastal troughs carved out by glaciers.
Or: Steep U shaped valleys that connect with the sea and fill with water when the glaciers melt. Now keep scrolling;)
Explanation:
 
        
             
        
        
        
Answer:
One of the obvious benefits of a mixed economy is that the free market aspect allows prices of goods to be determined by supply and demand. ... Another advantage of the mixed economy system is its capitalist approach to rewarding the hardest workers or the most efficient enterprises in the market
Explanation:
maybe you asked for-Why does a mixed economy fit in on the Freedom Score?
 
        
             
        
        
        
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.