| A | B |
|---|
| the boundary between the mantle and the crust | Moho |
| the area around the earth that is affected by the earth's magnetic field | magnetosphere |
| the seismic waves that travel only through solids | S waves |
| the fastest seismic waves, which travel through solids, liquids, and gases | P waves |
| the central portion of the earth | core |
| the outermost, ridgid layer of the earth composed of the stiff upper layer of the mantle and the crust | lithosphere |
| the thin, hard outer layer of the earth | crust |
| the portion of the earth's interior that extends from from the outer core to the bottom of the crust | mantle |
| the layer of the upper mantle composed of low density rock material that is semiplastic, like putty | asthenosphere |
| the circular movement of heated materials to a cooler area and cooled materials to a warmer area | convection current |
