1. The Fiery Earth
Earth’s Interior

2. Earth’s Interior
Crust
Mantle
Outer Core
Inner Core

3. Crust How do we know? Thin, rocky outer layer Low density
Thick under continents, thin under oceans
3 rock types (I, S, M)
Split into pieces (plates)
How do we know?
Earthquakes/Seismic Waves

4. Mantle How do we know? Thick, plastic-like layer
Slightly higher density
Convection currents
How do we know?
Plate tectonics
Changes in seismic wave speeds

5. Outer Core How do we know? Thick liquid layer Iron & Nickel
Much higher density
How do we know?
Earth’s magnetic field
No S-waves

6. Inner Core How do we know? Central solid layer Iron & Nickel
Very high density
How do we know?
Earth’s magnetic field