| A | B |
|---|
| Crust | thin, solid outermost layer of the earth above the mantle |
| Mantle | the layer of rock between the Earth's crust and core |
| Core | the central part of the Earth below the mantle |
| Lithosphere | the outermost, ridged layer of the Earth that consist of the crust and the rigid upper part of the mantle |
| Asthenosphere | the soft layer of the mantle on which tectonic plates move |
| Mesosphere | the strong, lower part of the mantle between the asthenosphere and the outer core |
| Tectonic Plate | a block of lithosphere that consist of the crust and the rigid outermost part of the mantle |
| Inner Core | the solid part of the core |
| Outer Core | the liquid part of the core |
| Density | the ratio of mass to volume |
