| A | B |
|---|
| Layer directly above the core | mantle |
| Layer that includes crust and upper mantle | lithosphere |
| Plates collide along it | convergent boundary |
| Forms where two plates move apart | rift |
| Point in Earth's crust where an earthquake starts | focus |
| Push-pull wave caused by earthquakes | P wave |
| Mountain that forms around an opening in Earth's crust | volcano |
| Earthquake wave that makes the ground roll and sway | surface wave |
| Process that forms new sea floor along a rift | sea-floor spreading |
| innermost layer of the earth | core |
| Theory of plate movement | plate tectonics |
| Plates gring past each other along it | surface waves |
| Point on Earth's surface directly above focus | epicenter |
| Up-and-down, slower wave in Earth's crust | S wave |
| Scale that measures amount of earthquake energy | Richter scale |
| Sudden movemnt of rocks in Earth's crust | earthquake |
| Chain of mountains through the oceans | mid-ocean ridge |
| Plates move away from each other along it | divergent boundary |
| Zone of partially melted rock in upper mantle | asthenosphere |
| Outermost layer of the Earth | crust |
