I believe it is temperature or rainfall. All of the factors are improtant but temperature comes first, cuz the temperature can also determine the air, and soil doesn't make a difference. Longitude doesn't have to do with an ecosystem.
        
                    
             
        
        
        
Answer:
The answer should be  
NaI→2Na+I2. :)
 
        
                    
             
        
        
        
Answer:
To give the people a sense of safety knowing that they are completely safe in an Earthquake.
To survive another fault shift.
To reinforce and renovate the stadium.
To preserve the stadium in an Earthquake.
 
        
             
        
        
        
This is false!
Carbon is found in many substances!
For example, we breathe out carbon (Carbon dioxide) and as a result, there is an amoung of carbon in the air. 
Carbon is also found in many rock types, such as in coal.