Barnett - Plate tectonics
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| divergent | boundary where 2 plates are moving away from each other; associated with mid-ocean ridges
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| convergent | boundary where 2 plates are colliding; associated with deep-sea trenches, volcanoes, and mountains
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| transform | boundary where 2 plates are sliding past one another; associated with faults and earthquakes
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| Wegener | man who came up with the theory of continental drift
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| Hess | man given credit for the theory of plate tectonics
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| basalt | rock that covers most of the ocean floor
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| Pangaea | name of the supercontinent 200 million years ago
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| continental drift | theory stating the continents used to be joined in a single land mass and have since drifted to their current locations
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| subduction | one tectonic plate is being forced under another tectonic plate
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| mid-ocean ridge | chain of underwater mountains
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| deep-sea trench | long, narrow depression on the ocean floor; occurs at convergent boundaries
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| plate tectonics | theory that the Earth's crust is broken into plates which move in different directions at different speeds
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| lithosphere | strong, rigid layer of Earth including the uppermost mantle and overlying crust
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| asthenosphere | a weak plastic-like layer of the mantle situated below the lithosphere; convection currents happen here
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| seafllor spreading | theory stating that new crust is made at mid-ocean ridges and old crust is destroyed at deep-sea trenches
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| rift valley | long narrow depression that forms when continental crust separates at a divergent boundary
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| fault | fracture in the Earth's crust; transform boundary
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