| A | B |
|---|
| asthenosphere | plastic-like layer below the lithosphere |
| continental drift | idea that continents moved to their current positions on Earth by plowing through the ocean floor |
| convection current | motion underlying plate tectonics |
| convergent boundary | boundary at which plates collide |
| divergent boundary | boundary where plates move apart from each other |
| magnetometer | instrument for studying Earth’s magnetic field |
| Pangaea | large landmass made of all continents |
| plates | large sections of Earth’s crust and upper mantle |
| seafloor spreading | process that forms new seafloor |
| transform fault | place where plates slide past one another |
