The answer is 15 bc you multiply the coefficient but the subscript
        
             
        
        
        
Answer:
Fast change
Explanation:
Weathering, erosion, and deposition are examples of slow change. Earthquakes, erupting volcanoes, and landslides happen fast. Therefore, they can change the Earth's surface very quickly.
 
        
             
        
        
        
Answer:
about 79% (79.04369332 to be exact)
Explanation:
Percent composition=(Molar mass of element x amount of it)/Molar mass of compound x 100
Br= 3 x 79.9/303.25 x100=79.04369332
 
        
             
        
        
        
1. Hydrogen has 1 electron.
        
                    
             
        
        
        
Answer:
lower mantle
Explanation:
because the core and the crust are solid.