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Plate tectonics

Barnett - Plate tectonics

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