True!The both talk about the overall moral of the story.
For an example
THEME Central 
Jealousy. Mya always wanted the same 
 thing Layla had.
Hard work pays 
Off. Tyianna worked for hours to 
 earn money.
Bravery||||Even though Tim was afriad Of heights he still climbed up  the mountain.
So basically a theme is telling you something all in one word and a central idea is giving you details.
Hopes this helps.
        
             
        
        
        
1.	narwhal  what Aronnax thinks the monster may be (a sea unicorn)  
2.	Abraham Lincoln  United States' government boat  
3.	static character  does not change  
4.	scientist  Aronnax  
5.	shaped like a cylinder  Nautilus  
6.	denouement  name of the resolving action after the climax  
7.	20,000 Leagues Under the Sea	  science fiction	
 
        
             
        
        
        
Answer:Characters: Kate, Darby, Tracy, Mr. Jacks
Setting: takes place in an airplane at night.
Purpose: I think the purpose it's to tell how Kate is reacting inside the airplane before it gets in an accident with no food when she is trying to scape....
Conflict: all the passengers got trapped on the airplane at night wit no supplies.
rising action: the moment that the story says "She ran past one plane after another. They were all parked in the hangar, just as they had been the day the force fields came down around the airport, trapping fifteen hundred people inside. The force fields seemed to be electromagnetic prisons, although no one knew for sure what they were made from or for what purpose. They appeared around cities and small towns, around farms and islands, and even around tiny villages in the middle of Africa. They were everywhere—and nobody knew who put them there."
Climax: when she finally scape from the airplane, thanks to a space bellow the mirror.
Resolution conflict: She scape from the airport but she fell fear and guilty because on the back of the mirror that she scape says " Use this to get out, from Kate" so she and Mr. Jacks were the only ones how scape.
I hope this help : )