It's the bonds actg and the order their in
        
             
        
        
        
Answer:
Continental crust is typically 40 km (25 miles) thick, while oceanic crust is much thinner, averaging about 6 km (4 miles) in thickness. The effect of the different densities of lithospheric rock can be seen in the different average elevations of continental and oceanic crust.
Explanation:
 
        
                    
             
        
        
        

When seawater seeps down into the ocean crust and is heated by the magma, it undergoes lots of chemical reactions. When the fluid rises up through the seafloor, it carries many new chemicals with it, such as-- copper and zinc. 
These chemical reactions also remove chemicals from the seawater, such as oxygen and magnesium.
So clearly vebtus fluid is different from sea water .
HOPE IT HELPS YOU.