As the ocean currents go around, they gather garbage from around the world and bring it to the centre of the pacific ocean where current is proven to be weakest. It can also be found in the Indian ocean and the Atlantic ocean.
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The variable is y and y=2.
        
                    
             
        
        
        
Sahara is the answer! hope this helps! :)
        
                    
             
        
        
        
Continental drift is the name of this theory.