It takes 8 electrons to fill a shell.
        
                    
             
        
        
        
Answer: Igneous rock forms between sedimentary layers.
This can definitely help in determining relative age because sedimentary rocks will be the older rock than igneous rock as igneous rock has formed between sedimentary rocks
Explanation:
 
        
             
        
        
        
sand dunes
because it is and sand dunes get deposited