The answer is the less dense plate slides over the denser plate.
 
        
             
        
        
        
Answer:
D. Less rain and snow.  
Explanation:
A factor that can be a account for a drop in the water table is, less rain and snow. to topography, water tables is influenced by lot of factors, including the geology, weather, ground cover.
 
        
             
        
        
        
I think the answer might be b