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Chapter 7: Plate Techtonics
Vocabulary
12
Science
8th Grade
11/30/2012

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Term
continental drift
Definition
theory that continents have moved slowly to their current locations.  Proposed by Alfred Wegener.
Term
Pangaea
Definition
the large landmass that Wegener proposed broke apart 200 million years ago.
Term
seafloor spreading
Definition
Harry Hess proposed that hot, less dense material below Earth's crust rises toward the surface at the mid-ocean ridges.
Term
plate techtonics
Definition
theory that says Earth's crust and part of the upper mantle are broken into sections
Term
plates
Definition
sections of the upper mantle of the Earth's crust.
Term
lithosphere
Definition
the combination of crust and part of the upper mantle
Term
asthenosphere
Definition
the plasticlike layer below the lithosphere
Term
convection current
Definition
the cycle of heating, rising, cooling, and sinking.
Term
divergent
Definition
divided and moving apart
Term
convergent
Definition
moving together
Term
subduction
Definition
occurs when one plate is forced under another plate
Term
strike-slip fault
Definition
occurs when plates slide past each other in the opposite direction
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