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Plate Techtonics Vocabulary
Plate Techtonics Vocaulary Words Mrs. Thompsen
13
Science
8th Grade
02/14/2008

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