1. Layers of the Earth
Kim Lachler
Updated 2014
NCES 6.E.1.3

2. Density
Before talking about the layers of the earth it is important to understand density.

3. Density Density = Mass/Volume Coke/diet coke demo
Both cans have the same volume.
Why did the coke sink and the diet float?
Coke has more sugar, therefore more mass per volume.

4. There are 2 different models to show the layers of the Earth
There are 2 different models to show the layers of the Earth. The_Inner_Structure_of_the_Earth.mov
Composition
It is based on the compounds of the Earth. In other words, what they are made of.
Physical Structure
- It is based on the physical properties. In other
words, what it is like.

5. Composition Layers
Crust
Mantle
Core

6. Composition Layers The crust Outer most layer Thinnest layer
km thick ( the ocean or a mountain)
Less than 1% of the Earth’s mass

7. Composition Layers Oceanic crust Continental crust Denser
Consist mainly of the elements iron, calcium, and magnesium.
Continental crust
Less dense
Consist mainly of oxygen, silicon, and aluminum.

8. Composition Layers The mantle Denser then the crust
Contains more magnesium
2,900 km thick
Makes up 67% of the Earth’s mass

9. Composition Layers Core Center of the Earth Denser
Containing Iron and Nickel
3,430 km thick
33% of the Earth’s mass

10. Most models crust mantle outer core inner core
Most models of the layers of the Earth divide the core layer into its physical layers.
-Outer core – which
is in a liquid state.
Inner core – which
is in a solid state.
mantle
outer core
inner core

11. Bibliography
Holt, Rinehart, Winston, North Carolina Holt Science & Technology, Orlando, Fl, 2005
Google Images , Layers of the Earth accessed 9/26/2010