| A | B |
|---|
| convergent boundary | plate boundary where two tectonic plates move towards each other |
| divergent boundary | plate boundary where two tectonic plates move away from each other |
| transform boundary | plate boundary where two tectonic plates slide or glide past each other |
| continental drift | theory that the continents were once joined and then moved to their current positions |
| crust | uppermost layer of Earth's surface |
| mantle | layer of Earth that is molten and convection currents cause the tectonic plates to move |
| outer core | liquid part of the core |
| inner core | solid part of the core |
| magma | molten rock found underground |
| lava | molten rock found on the surface of Earth |
