| A | B |
|---|
| seismic waves | Vibrations that travel through Earth carring the energy released during an earthquake. |
| pressure | The force exerted on a surface divided by the area over which the force is exerted. |
| crust | The layer of rock that forms Earth's outer surface. |
| basalt | A dark, dense, igneous rock found in oceanic crust. |
| granite | A usually light colored igneous rock that is found in continental crust. |
| mantle | The layer of hot magma between Earth's crust and core. |
| lithosphere | The outer layer of Earth, consisting of the crust and the topmost part of the mantle. |
| asthenosphere | The solid middle layer of mantle that is able to move and change form |
| 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 the Earth. |
| density | the amount of matter within a given space |
| composition | the type of material that an object is made of |
