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| sections of Earth's litosphere that is composed of crust and upper mantle (continental and oceanic plates) |
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| theory that crust and upper mantle move on plastic like layer of the mantle. |
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| ocean crust, continental crust, rigid upper mantle (about 100 km thick) |
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| plastic-like layer beneath the lithosphere |
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| solid, dense, mostly iron and some nickel |
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| hypothesis that continents moved slowly to their current locations (Alfred Wegener, 1912) |
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| single large land mass made up of all continents connected that broke apart 200 million years ago |
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| theory that magma moving upward spreads seafloor apart at mid ocean |
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| cycle of heating, rising, cooling, sinking that makes plates move |
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| area where one plate sinks below another; most dense plate sinks |
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| area where two plates move towards eachother |
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| area where two plates move away from eachother |
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