1. Layers of Earth

2. Crust Outermost layer Thinnest under ocean Thickest under continent
Crust + top of mantle = Lithosphere

3. Crust density Least dense overall layer
Oceanic crust (basalt) is more dense than
Continental Crust (granite)

4. Crust composition Solid rock—mostly silicon and oxygen
Oceanic crust—basalt
Continental crust--granite

5. Mantle Position
Middle layer, thickest layer
Top portion called the asthenosphere

6. Density increases with depth of increasing pressure
Mantle Density
Density increases with depth of increasing pressure

7. Mantle Composition Hot softened rock
Contains iron (Fe) and magnesium (Mg)

8. Core position
Inner layer
Consists of the outer and inner core

9. Core density
Heaviest material; most dense layer

10. Core composition Mostly iron and nickel Outer core—slow flowing liquid
Inner core--solid

11. Thickness of Layers
Crust: (continental) miles thick (1 % of Earth’s volume)
Mantle: 1,800 miles thick (84% of Earth’s volume)
Outer core: 1,400 miles thick
Inner core: 790 miles thick