Answer:
Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations (energy) faster.
Explanation:
 
        
                    
             
        
        
        
Answer:
<u>A</u> One of the key elements in creating a green economy is the construction of <u>green buildings</u>.  
Explanation:
Any economy relies on businesses and buildings, so a green economy is going to need green buildings to support a green economy as well. 
 
        
             
        
        
        
Covalent bonds allow carbon atoms to form numerous compounds.