I think Wheat is the answer. China primarily produces rice wheat and potatoes and a lot of other things.
        
                    
             
        
        
        
The capital of Greece is Athens
        
                    
             
        
        
        
Explanation:
The Earth is comprised of many plates that float on the hot magma in the mantle layer. They are constantly moving but its so slow we can't feel it. A long time ago, all the land on Earth was connected in one big continent named Pangaea. As the plates have moved the land has separated forming the continents.
When plates come together they cause friction between them. This causes the plates to push up forming a mountain. This was how the Himalayan mountains were formed.