In the earths mantle the convection currents pass through the mantle which then causes friction in the tectonic plates causing earthquakes,volcanoes or tsunamis
        
                    
             
        
        
        
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On the oceans of the Earth, gravity and inertia work in opposition, causing tidal bulges on opposite sides of the planet. The moon's gravitational force pulls the ocean's waters toward it on the "near" side of the Earth (the side facing the moon), resulting in a bulge.
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Ecuador is the largest exporter of bananas
        
             
        
        
        
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A.it prevent some UV rays 
 
        
                    
             
        
        
        
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The amount of water on earth is constant, or nearly so.