1. The Earth’s Interior

2. Most of what we know is from geophysics

3. Evidence from Seismic Waves Seismic Reflection Seismic Refraction

7. Earth’s Internal Structure The Core P-wave Shadow Zone S-wave Shadow Zones Liquid Outer Core Solid Inner Core

9. S-Wave Shadow Zone

10. Earth’s Internal Structure The Earth’s Crust Continental crust- sial Less dense and thicker than oceanic crust Oceanic crust- sima Mohorovicic discontinuity

11. P-Wave Velocities & Boundaries Moho

12. Earth’s Internal Structure The Mantle Ultramafic Rock Lithosphere Crust & uppermost mantle Asthenosphere Low velocity zone Lower mantle

14. Earth’s Internal Structure Composition of the Core Made of metal The Core-Mantle Boundary Convection in both core and mantle