Answer:
D. pacific islands 
Explanation:
took the usatestprep and got it right
 
        
             
        
        
        
Answer:
The Crust is mostly made up of loose materials.
The Mantle is made of up of a thick solid rock substance.
The Outer Core is made of super heated liquid molten lava.
The Inner Core is believed to be solid ball of mostly iron, and nickel.
Explanation:
 
        
             
        
        
        
D. Greenhouse gas feddback
I'm not for sure but I believe this is the answer sorry if I get it wrong in advance