1. 1. What object did Copernicus think was the center of the
universe?
2. Out of what did the solar system form, according to the nebular
model?
3. Name three types of “rocks” that can be found in space.
4. What lies in the region between the inner planets and the outer
planets?
5. What is the name of the largest satellite orbiting the Earth?
The Sun
A giant cloud of dust and gas
Asteroids, meteoroids, comets, satellites, planets
The Asteroid belt
The Moon

2. ReviewReview
Gravity
Solar system formation
The Solar Nebular
Theory

3. Layers of the EarthLayers of the Earth
We know that gravity
condensed dust particles, and
other pieces of matter, to form
the Earth
The Earth is not a solid ball

4. Layers of the EarthLayers of the Earth
The Earth is made of
different layers
And it is a dynamic system
Constantly in motion and
constantly changing

6. CrustCrust
Solid, outer layer of the
Earth
“thin” in some places
Under the oceans =
5-10km thick
Inner Earth

7. CrustCrust
“thick” in other places
Under the continents
= 30-70km thick
8

8. Crust Mantle Outer Core Inner Core
Crust
0-70 km deep
Mantle
70-2885 km deep
Outer Core
2885-5155 km deep
Inner Core
5155-6371 km deep

9. MantleMantle
Layer below the crust
Upper part is solidish
Lower part is like a thick
liquid
Inner Earth

10. Outer CoreOuter Core
Liquid layer
Molten iron and
nickel
Inner Earth

11. Inner CoreInner Core
Solid layer
Solid iron and
nickel
Inner Earth

12. Thickness
Depth
Continent Crust
Ocean Crust