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Earth's Layers
1. How do we think the Earth formed 4.5 billion years ago? Explain this process.
The ancient solar system was filled with many ________ and small ________.
Gravity pulled these __________, meteors, and ___________ planets toward the Earth.
2. Describe the early Earth.
The ancient Earth was so ______ that solid rock melted across the __________ _________.
3. Why was the early Earth so hot?
4. What is radioactive decay and what radioactive element do we think is in the inner core?
Radioactive decay is extra _________ that is kicked out by the __________ so that it can
become stable.
5. What are the 4 layers of the Earth based on composition?
6. Describe the crust.
___________ layer (6-70km thick). Composed of many different ____________ and all
types of _________. High concentration of __________, _________, and _________
7. Describe the mantle.
Thickest layer. _______km thick (______% of Earth’s Volume). Composed
of _________, __________, __________, and ____________.
8. Describe the outer core.
9. Describe the inner core.
10. What are the 5 layers of the Earth based on physical properties?
11. Describe the difference between the crust and the lithosphere.
The ________, outermost _________ layer of the Earth. Broken into large pieces
called ___________ ____________.
12. Describe the asthenosphere.
Literally means __________ ___________. It is a __________ layer, but it gets so
hot that it __________ like chewed chewing gum and ___________ in large circles
called _____________ _____________.
14. What happens in a convection current? (Be sure to describe density and temperature)
You can draw arrows and label the diagram below!
As __________ heats up, the ___________ gain energy and
__________ nearby particles away, becoming ________ dense.
Lower density material __________. As ___________ cools down,
away from the heat source, the ______________ lose energy and
become ____________. This material ____________.
15. What happens to temperature, pressure, and density as you move deeper into the
16. Why is the Earth’s interior so hot?
17. Where would you find the most dense type of rock?
The “___________ ___________” and is far more __________ and ________ than the
asthenosphere. It _________ the core layers.
18: Planetary Differentiation:
This is the process in which _________ dense materials of a planet ___________ to the center,
while ________ dense materials stay on the ____________