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objective 9
vocad
| Term | Definition |
|---|---|
| Continental Drift | Hypothesis that continents are in constant motion |
| Mantle | Middle layer of the earth situated between the crust above and the core below |
| Pangaea | Ancient supercontinent composed of land that forms todays continents |
| Mid- Ocean Ridge | Mountain range located on the seafloor in the middle of the ocean |
| Seafloor Spread | New oceanic crust forms at a mid- Ocean ridge as old oceanic crust moves away |
| Convection | Circulation of material caused by differences in temperature and density |
| Convergent Plate Boundary | Where two plates collide |
| Divergent Plate Boundary | Where two plates separate |
| Lithosphere | Cold, rigid outermost rock layer of earth |
| Plate Tectonics | Theory that Earth's surface is made of rock plates that move with respect to each other |
| Subduction | Sinking of a denser plate below a more buoyant plate at a convergent plate Boundary |
| Transform Plate Boundary | Where two plates slide by each other |