| A | B |
|---|
| instrument for studying Earth's magnetic field | magnetometer |
| plasticlike layer below the lithosphere | asthenosphere |
| idea that continents moved to their current positions on Earth by plowing through the ocean floor | continental drift |
| large landmass made of all continents | Pangea |
| force behind plate tectonics | convection current |
| process that forms new seafloor | seafloor spreading |
| large sections of the Earth's crust and mantle | plate tectonics |
| boundary where plates move apart from each other | divergent boundary |
| boundary at which plates collide | convergent boundary |
| place where plates slide past one another | transform fault |
| area where an oceanic plate descends into the upper mantle | subduction zone |
