| A | B |
|---|
| seismic waves | vibrations that travel through Earth carrying the energy released during an earthquake. These vibrations travel from the epicenter outward in all directions. |
| pressure | the force exerted on a surface divided by the total area over which the force is exerted |
| crust | the layer of rock that forms the Earth's outer surface |
| basalt | a dark,dense,igneous rock with a fine texture, found in the ocean's crust |
| granite | a usually light-colored igneous rock that is found in the continental crust |
| mantle | the layer of hot, solid material between the Earth's crust and core |
| lithosphere | a rigid layer made up of the uppermost part of the mantle and the lowermost part of the crust |
| asthenosphere | the soft layer of the mantle on which the lithosphere floats |
| outer core | a layer of molten iron and nickel that surrounds the inner core of Earth |
| inner core | a dense sphere of solid iron and nickel at the center of Earth |
