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Unit 5.2 vocab
| Term | Definition |
|---|---|
| continental drift | The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations |
| pangaea | The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents |
| alfred wegener | A German scientist who proposed the theory of continental drift |
| 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 move past each other in opposite directions |
| magnetic polarity | Direction of magnetic north pole on earth |
| normal polarity | A magnetic field that is the same as that which exists at present |
| reverse polarity | A magnetic field opposite to that which exists at present. |
| magnetite | Magnetic, gray or black streaked rock |
| harry hess | Scientist who proposed the theory of sea-floor spreading |
| seafloor spreading | The process that creates new seafloor as plates move away from each other at the mid-ocean ridges |
| mid ocean ridge | An underwater mountain chain where new ocean floor is formed |
| subduction | The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate |
| deep ocean trench | A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle |
| rift valley | A deep valley that forms where two plates move apart |
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