Packet 4: Earth’s Interior.  Circulation due to differences in density which causes convection currents  Earth’s interior is inferred by scientists.

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Packet 4: Earth’s Interior

 Circulation due to differences in density which causes convection currents  Earth’s interior is inferred by scientists based on earthquake waves (seismic data) and studying meteorites  ESRT page 10 – Inferred Properties of Earth’s Interior  ESRT front page – Chemical Composition chart

 Continental drift suggests present-day continents once fit together like puzzle parts  Earth’s magnetic field has reversed with time  Magnetic reversals (orientation) support theory of seafloor spreading  Rising convection currents cause high-heat floors at the ridge center  Rocks are youngest at ridge, older as you move away