| Question | Answer |
| seismic waves | vibrations that travel through earth carrying the energy released during an earthquake. |
| pressure | The force exerted on a surface divided by the total area which the force is exerted. |
| crust | the layer of rock that forms on the earth's outer surface |
| basalt | a dark, dense, igneous rock with a fine texture, found in oceanic crust |
| mantle | The layer of hot , solid material between earth's crust and core |
| lithosphere | a rigid layer made up of the uppermost part of the mantle and the crust |
| outer core | a layer of molten iron and nickel that surrounds the inner core of the |
| inner core | a dense sphere of solid iron and nickel at the center of the earth |
| asthenosphere | The soft layer of mantle on which the lithosphere floats. |
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