EEPS (plate tectonics 1)

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7 Terms

1
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Plate tectonics

describes the movement of the lithosphere in response to mantle convection.

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Alfred Wegener

Proposed the theory of “continental drift”

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Continental drift explained 

  • Shape of continents 

  • Contiguous geological features 

  • Evidence of past glaciers near the equator 

  • Fossils of similar animals on unconnected continents 

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Magnetism in ocean crust 

Magnetometer record showing symmetrical magnetic field across ridge. 

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Earth’s Magnetic field

  • Earth’s rotation causes spiral flow in the liquid outer core that aligns with spin axis.

  • Electrically charged spiral flow generates Earth’s magnetic field

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Where is new crust created?

Mid-ocean ridges

  • Convection flow of mantle pushes plate outwards.

  • Old plates are recycled into the mantle (subduction).

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Supercontinent Cycle (Wilson Cycle)

  1. Supercontinent

  2. Continental rifting

  3. Seafloor spreading

  4. Subduction Initiation

  5. Convergence

  6. Orogenesis