PLATE TECTONICS THEORY

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5 Terms

1
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lithosphere

  • composed of the crust and the upper mantle

2
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two types of crust

  • continental → less s]dense making it float above

  • oceanic → the desner oceanic crust

3
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continental drift theory

  • Alfred Wegener (1912)

  • a supercontinental land mass called Pangea

  • bro failed to explain why the continents drifted

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seafloor spread theory

  • Harry Hess (1960's)

  • the oceanic crust / seafloor

  • moves and carries along the continental crust

  • movement of the seafloor leads to the rise of magma

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plate tectonics theory

  • suggests that the lithosphere is composed of fragments called plates

  • plates can be large or small, move around, and interact with eachother

  • plates move due to convection currents in the mantle