The Earth’s Interior - PowerPoint PPT Presentation

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The Earth’s Interior

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  1. The Earth’s Interior

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

  3. Evidence from Seismic Waves • Seismic Reflection • Seismic Refraction

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

  5. S-Wave Shadow Zone

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

  7. P-Wave Velocities & Boundaries Moho

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

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