| A | B |
|---|
| Crust | Thin outer layer of the earth |
| Mantle | Middle portion of the earth. |
| Outer Core | Liquid inner part of the earth. |
| Inner Core | Solid metal part of the earth. |
| Asthenosphere | Flexible part of the upper mantle. |
| Lithosphere | Solid ridged layer made of the crust and upper mantle. |
| Radiation | Movement of heat through space by waves. |
| Conduction | Movement of heat by contact |
| Convection | Movement of heat because of density differences. |
| Convection Currents | Liquid or air moving because of density differences |
