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plate tectonics
| Term | Definition |
|---|---|
| continental drift | Wegener's hypothesis that earth's continents had once been joined as a single landmass. |
| divergent boundaries | places where plates move apart. |
| Pangaea | earth's continents were once joined as a single landmass. |
| convergent boundaries | plates come together. |
| magnetic reversal | A change in Earth's magnetic field. |