| A | B |
|---|
| seismic waves | waves produced by earthquakes |
| pressure | results from a force pressing on an area |
| crust | the layer of rock that forms Earth's outer skin |
| mantle | layer of hot rock below the crust |
| lithosphere | a rigid layer formed by the crust and the uppermost part of the mantle |
| asthenosphere | the soft layer of the mantle below the lithosphere |
| outer core | the layer of molten metal that surrounds the inner core; it is liquid |
| inner core | a dense ball of solid metal; it is solid |
| radiation | the transfer of energy through space |
| conduction | heat transfer within a material or between materials that are touching |
| convection | heat transfer by the movement of currents within a fluid (a liquid or a gas) |
| convection current | the flow that transfers heat within a fluid (a liquid or a gas); the flow as a cooler, denser fluid sinks and the warmer, less dense fluid rises |
