1. Earth Part 2
G. Yannakoulias

2. Earth’s Layers

3. Image of Earth’s Crust

4. Earth’s Crust Thin layer of solid rock surrounding Earth
Thickness of crust varies depending whether oceanic or continental crust
Thinner under the oceans—called oceanic crust (10 km)
Thicker under the continents—continental crust (40 km)
Continental crust—mostly granite rock
Oceanic crust—mostly basalt rock

5. Image of Earth’s Mantle—Upper and Lower Mantle Exist

6. Upper Mantle Thickness: 660 km Temperatures: 500-1000 degrees Celsium
Top part of this layer is solid
Top part of solid mantle and crust together make up the lithosphere (Gk. lithos = rock)
Lower part of upper mantle is “gooey” like taffy and is responsible for movement of surface plates through convection currents

7. Lower Mantle Thickness: 2200 km
Temperatures: degrees celsius
Mostly solid in texture
Made of dense solid rock

8. Outer Core

9. Outer Core Composition
Liquid layer
2270 km in thickness
Made of mostly iron and nickel
Responsible for creating the magnetic field of the Earth
Temperatures: degrees Celsius

10. Inner Core Thickness: 1200 km Temperature: 5000-6000 degrees Celsius
Solid in Composition
Solid due to high pressures