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1. 
How many miles is it to the center of the earth?
2. 
How many layers are there in the earth?
3. 
The top layer of the earth is called the...
4. 
How many miles thick is the top layer?
5. 
Is the top layer solid rock or liquid rock?
6. 
What is the second layer called?
7. 
The second layer is composed of what? (liquid rock that flows like thick syrup)
8. 
How thick is the second layer?
9. 
What is the third layer called?
10. 
What is the third layer made of?
11. 
The fourth layer is called the...
12. 
The inner core is about the size of the...
13. 
What keeps the inner core from melting?
14. 
The inner core is hotter than the surface of what?