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1. 
The interior of the Earth is hot due to which (pick all correct answers)
A.
The core is nuclear (radioactive)
B.
Solar radiation from the sun
C.
Collisions from the asteroids and planetesimals during Earth's formation
D.
Pressure from the rocks above pushing down
E.
Friction from more dense materials sinking and less dense materials rising during Earth's formation
F.
Gravitational pull of the moon on the Earth
2. 
Why did the Earth get hotter during Earth's formation? (pick more than one answer)
A.
When the planetesimals collided energy was released as heat
B.
The solar radiation from the sun melted the Earth
C.
Friction from more dense materials sinking and less dense materials rising during Earth's formation
D.
The radioactive core releases heat energy
E.
The gravitational pull between the sun and the moon
3. 
During Earth's formation Earth was
A.
Solid
B.
Liquid
C.
Liquid and solid
4. 
Which is true?
A.
The Earth is still cooling off from the heat generated during its formation
B.
The Earth has long cooled off from the heat generated during its formation
5. 
Why hasn't the interior of the Earth cooled off? (pick 2)
A.
The crust acts as an insulator and keeps the heat in
B.
The radioactive core continues to release heat energy
C.
The sinking dense uranium and iron continues to cause frictional heat
D.
The planetesimals colliding with Earth continues to generate heat
E.
The gravitational pull between the Earth and moon continues to occur today
F.
The solar radiation from the sun continues to strike Earth
6. 
Very deep mines are ...
A.
Cool/cold in temperature
B.
Warm/hot in temperature
7. 
The core is nuclear for what reason?
A.
Contains radioactive uranium
B.
Contains radioactive iron
C.
Contains radioactive nickel
D.
This is where the magnetic field is generated
8. 
When the Earth was forming it was struck by planetesimals. When these planetesimals struck Earth which occurred?
A.
Friction was generated and heat released
B.
Explosions occurred causing Earth to break up into pieces
C.
A magnetic field was created
D.
All choices
9. 
During Earth's formation more dense materials sank to the core. Less dense materials floated to the surface. What occurred due to this?
A.
Friction was created generating heat
B.
Radioactive material was created by the reaction causing the core to be formed
C.
The movement caused the Earth to begin to spin. This caused the day
D.
All choices
10. 
Which is the only item that is still generating heat today?
A.
The radioactive core releases heat
B.
Heat generated during Earth's formation
C.
Gravitational pull between the sun and moon
D.
Earth being hit by solar radiation from the sun
E.
All choices
11. 
The reason why the interior of Earth is hot AND still generates heat today
A.
Radioactive core
B.
Friction from Earth separating into three layers during Earth's formation
C.
Friction from the planetisimals striking Earth during Earth's formation
D.
All choices
12. 
During Earth's formation planetesimals and asteroids did this with Earth generating heat
A.
Collisioided
B.
Earth separated into three layers due to density
C.
Radioactive core
D.
All choices
13. 
During Earth's formation more dense items sank and less dense items rose. As they went by one another heat was generated by this.
A.
Friction
B.
Nuclear/Radioactive reactions in the core
C.
Pressure
D.
All choices
14. 
We are still cooling off from the heat generated during Earth's formation
A.
True
B.
False
15. 
As we go towards the surface the pressure
A.
Increases
B.
Decreases
16. 
When collision occurred during Earth's formation the temperature...
A.
Increased
B.
Decreased
C.
Stayed the same
17. 
The Earth is still generating heat from Earth's formation
A.
True
B.
False
18. 
During Earth's formation and the materials separated into the three layers what was released from this separation?
A.
Heat
B.
Radiation
C.
Pressure
D.
All choices
19. 
Found in the core that causes the core to be hot
A.
Uranium
B.
Iron
C.
Nickel
D.
All choices
20. 
This has the least effect on why the interior of the Earth is hot
A.
Pressure
B.
Radioactive core
C.
Heat from the formation of Earth