Answer:
<em>Option</em><em> </em><em>A)</em><em> </em><em>humidity</em><em> and</em><em> </em><em>temperature</em>
 
        
             
        
        
        
thousands of years
Explanation:
A delta the size of the Mississippi River will take several thousand of years to form because the process of formation of a delta is geologically controlled. 
A delta is a place where  river enters or drains into the sea with many mouth or outlets. 
Deltas are depositional terrain full of dis-tributaries.
- For a delta to form, a terrain must be close to the mouth of an ocean or a larger body of water. 
- The entering stream must be large enough and have large amount of sediment. 
- The river mouth must have been cut to the same level with that of the drainage basin. 
- Most rivers such terrain should be at their lower course where they flow with very low velocity. 
- Wave action should be minimal along such coasts. 
These processes takes several thousands of years if not millions. 
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The activation energy of a chemical reaction is closely related to its rate. Specifically, the higher the activation energy, the slower the chemical reaction will be. This is because molecules can only complete the reaction once they have reached the top of the activation energy barrier.