Answer:
first off, what are the answer choices, second, Then would be the best word to join the sentences.
 
        
                    
             
        
        
        
Answer:
Minerals are classified by key chemical constituents; the two dominant systems are the Dana classification and the Strunz classification. Silicate minerals comprise approximately 90% of the Earth's crust.
Explanation:
Hope this helps! Brainliest please?
 
        
                    
             
        
        
        
Answer:
Conor's mother and Lily's mother have been friends for a long time, and Conor and Lily grew up together. This sequence of events makes Conor frustrated with her, to the point where he gets her into trouble while she was trying to save Conor from being bullied by Harry.
 
        
             
        
        
        
They set up their own forts in governent granted lands.