| A | B |
|---|
| Crust | outermost layer of earth composed of rocks |
| Mantle | Layer below the crust, where convection currents are located |
| Outer core | Liquid part of core, composed of nickel and iron |
| inner core | solid, inner-most layer, composed of iron and nickel |
| Asthenosphere | Layer below the lithosphere that is formed of upper mantle |
| Lithosphere | Hard outer layer of crust formed mainly of rocks and dirt. |
| Oceanic plates | Area where new crust is formed |
| Continental plates | Area where older, less dense crust is located |
| Subduction zone | Area where denser, oceanic crust slides under lighter continental crust |
| Convection current | Circular conveyer of molten magma located in mantle |
| Divergent fault | area of tectonic plates that move away from each other |
| Convergent fault | Area where tectonic plates move towards each other |
| Trench | Deep depression in the ocean floor |
| Ridge | An area of oceanic crust that is raised above seafloor level |
| Pangea | Ancient landmass which had all the continents together as one large piece |
