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Plate Tectonics Review. Chapter 8. The ______________ is made of partially melted, “plastic” rock material and plates “float” on it. asthenosphere. At subduction boundaries one plate __________________ another plate. Subducts/plunges/ sinks below. A transform boundary is when ___________.

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  • asthenosphere “plastic” rock material and plates “float” on it.


  • At “plastic” rock material and plates “float” on it.subductionboundaries one plate __________________ another plate










  • igneous minerals that “record” the direction of Earth’s magnetic field when the rock formed.



  • Fracture zones from each other by breaks called __________________ that are perpendicular (at right angles) to the ridge and are the source of earthquakes here.



  • Continental drift ______________________, which stated the continents have moved over time.







  • 1. volcanoes location/occurrence of:

  • 2. earthquakes

  • 3. the formation of new crust (sea floor)



  • normal geographic poles is known as _______________ polarity



  • Rift valley geographic poles is known as _______________ polarity




1 happens to the age of the rocks?

2

  • Label the layers…

3

4







  • Marianas another

  • Peru-Chile

  • Tonga

  • Aleutian



  • Reversed the geographic poles is known as _______________ polarity





  • 1. trenches convergent plate boundaries.

  • 2. volcanic island arcs (on the overriding plate)

  • 3. earthquakes (shallow to very deep)













  • ridge push cells in the asthenosphere (mantle) are ______________________ & _______________________(rising magma pushing the plates outward),& slab pull (cooling, sinking material pulls the plates down).


  • How do volcanoes at cells in the asthenosphere (mantle) are ______________________ & _______________________subduction boundaries erupt?

  • Why?


  • Violent, explosive eruptions cells in the asthenosphere (mantle) are ______________________ & _______________________

  • b/c silica-rich magma which is thick & gooey (hard for gases to escape)



  • current orientation (direction) of Earth’s magnetic field



  • (oceanic- orientation (direction) of Earth’s magnetic fieldcontienental) convergent/subduction boundary









  • (mid-) ocean ridge the ocean floor with a deep rift in the center is called a _____________________





  • Gentle, oozing eruptions the ocean floor with a deep rift in the center is called a _____________________

  • b/c magma is silica-poor, which makes it thin & runny (gases escape easily)









  • Plate tectonics formation, movements, and interactions of Earth’s lithospheric plates.


  • Why does one plate formation, movements, and interactions of Earth’s lithospheric plates.subductbelow another?


  • b/c the formation, movements, and interactions of Earth’s lithospheric plates.subducting plate is more dense





  • Convection magma to rise and cool magma to sink, allowing for plate movement.currents





  • mirror opposite sides of the ridge


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