The Earth’s Interior

The Earth’s Interior Most of what we know is from geophysics

Evidence from Seismic Waves Seismic Reflection Seismic Refraction

Earth’s Internal Structure The Core

P-wave Shadow Zone S-wave Shadow Zones Liquid Outer Core Solid Inner Core

S-Wave Shadow Zone

Earth’s Internal Structure

The Earth’s Crust Continental crust- sial

Less dense and thicker than oceanic crust Oceanic crust- sima Mohorovicic discontinuity

P-Wave Velocities & Boundaries

Moho

Earth’s Internal Structure The Mantle

Ultramafic Rock Lithosphere

Crust & uppermost mantle Asthenosphere

Low velocity zone Lower mantle

Earth’s Internal Structure Composition of the Core

Made of metal The Core-Mantle Boundary

Convection in both core and mantle