| Term | Definition |
| crust | CL -outermost layer made of rocky silicate material |
| mantle | CL- middle layer layer of dense rocky silicates making up 82% of earth's volume |
| core | CL-innermost layer made of iron and nickel |
| lithosphere | PL- outermost solid layer which floats on asthenosphere |
| asthenosphere | PL-soft rocky material (plasticity) under lithosphere |
| mesosphere | PL-solid (middle) layer |
| outer core | PL-liquid molten iron layer thought to be source of earth's magnetic field |
| inner core | PL- innermost layer solid layer |
| convection | circular flow of matter in currents in a heated material(boiling pasta) |
| continental crust | less dense crust on which continents float |
| oceanic crust | denser crust on which oceans float |
| seismic wave | shock waves from an earthquake |
| Moho | boundary between the crust and mantle where seismic waves speed up |