Plate Tectonic Theory
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| underwater mountain chain | mid-ocean ridge
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| mountains formed on land from the compression as two continental plates collide | fold mountains
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| proposed continental drift theory | Alfred Wegener
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| super-continent | Pangaea
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| plate boundary where plates slide past one another in opposite directions or one moves faster then the other in the same direction | transform boundary
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| plate boundary where plates move away from each other | divergent boundary
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| plate boundary where the plates collide | convergent boundary
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| outer layer of the Earth (traditional or by composition) | crust
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| inner layer of the Earth made of a liquid layer and a solid middle made mostly of iron (traditional or by composition) | core
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| layer of the Earth below the crust and above the core (traditional or by composition) | mantle
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| Earth layer made of the upper mantle and the crust | lithosphere
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| Earth's plastic-like layer in which convection currents occur in | asthenosphere
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| solid portion of the mantle | mesosphere
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| liquid portion of the center of the Earth | outer core
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| solid portion of the center of the Earth composed of mostly iron | inner core
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| currents within the Earth's mantle caused by heat from the Earth's core | convection cells
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| where one tectonic plate is pulled underneath another | subduction zone
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| Southern portion of the super-continent | Gondwanaland or Gondwana
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| Northern portion of the super-continent | Laurasia
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| the ratio of the mass of an object to its volume | density
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| switching of the Earth's North and South poles | magnetic reversal
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| the idea that new oceanic lithosphere forms as magma rises towards the surface and solidifies | sea-floor spreading
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| volcanic arc | a chain of volcanic mountains above a subduction zone
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| trench | a deep depression in the ocean floor
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| abyssal plain | a relatively flat, featureless spot on the ocean floor
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| continental shelf | ancient, weathered coastline of a continent
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Created by:
rdmonaghan
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