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Plate Tectonics
Ms. Miles Vocabulary
Question | Answer |
---|---|
continental drift | Old theory that earth's continents have moved over time. |
Alfred Wegener | Scientist who came up with the theory of continental drift. |
plate tectonics | The theory of the formation and movement of the plates that cover the Earth's surface. |
lithospheric plate | A rigid, but moving, piece of the Earth's surface. |
divergent boundary | A plate boundary where two plates move away from each other. |
convergent boundary | A plate boundary where two plates move toward each other. |
transform boundary | A plate boundary where two plates slide past each other. |
seafloor spreading | The process by which new ocean floor is being created at divergent plate boundaries. |
subduction | The process by which oceanic crust sinks beneath less dense crust at a convergent plate boundary. |
trench | Deep oceanic valley that forms where oceanic plates are subducting. |
mid-ocean ridge | Underwater chain of mountains that forms at divergent plate boundaries. |
Pangaea | The name of a single landmass that broke apart 225 million years ago. |
mantle | layer of hot solid material beneath Earth's crust and core. |
lithosphere | The rigid layer of earth made up of the uppermost part of the mantle and crust. |