| A | B |
|---|
| crust | the thin and solid outermost layer of Earth above the mantle |
| mantle | the layer of rock between Earth's crust and core |
| core | the central part of Earth below the mantle |
| convection | the movement of matter due to differences in density; the transfer of energy due to the movement of matter |
| lithosphere | the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle |
| asthenosphere | the soft layer of the mantle on which the tectonic plates move |
| mesosphere | the strong, lower part of the mantle between the asthenosphere and the outer core |
| free | match with free |
